Sihoo Doro S100 vs M18: Personal Review and Verdict

Last Updated on October 15, 2025 by Cassie Moorhead

If you’re torn between the Sihoo Doro S100 vs M18, I’ve tested both for weeks and can share what really matters. The Doro S100 feels more premium with its smooth recline and adaptive lumbar, while the M18 offers great comfort at a lower price. From long work hours to casual home use, each chair fits a different need. I’ve used these daily for content work here in the U.S., and I’ll break down which one’s worth your money and why it suits your space best.

Sihoo Doro S100 Ergonomic Office Chair Review

The Sihoo Doro S100 is a smart ergonomic chair that feels made for long days. I set it up in under 20 minutes and was surprised by how well it supports my back. The dual lumbar system moves with me, and the seat stays cool all day. For the price, it feels close to chairs that cost twice as much.

If you want comfort, support, and clean design, the Doro S100 is a solid pick for any home office.

To buy this product, Click here.

What I Like

• Back support that moves with you: The dual dynamic lumbar system uses two mesh plates that flex with your spine. It feels soft but firm. When I lean or shift, it stays in place and supports my lower back.
• Easy to adjust: The 4D armrests are my favorite part. They move up, down, forward, and side to side. They even turn when I recline. That keeps my arms in a natural spot and helps my shoulders stay relaxed.
• Seat comfort: The waterfall-shaped seat spreads my weight well. I feel no pressure on my legs, even after hours of sitting. The mesh keeps it breathable too.
• Smooth recline: The recline goes back to 135°. It’s nice for short breaks or when I want to stretch.
• Good build for the price: The chair feels strong and balanced. It’s BIFMA and SGS certified, which adds trust that it meets safety and quality standards.

What Could Be Better

• Lumbar fit for small users: If you’re under 5’5″, the lumbar panels might sit too high or wide. A smaller version could fix this.
• Material feel: The mesh works well for cooling, but it lacks the soft touch of fabric or memory foam.
• Recline angle: The 135° recline is fine for work, but not deep enough for full relaxation. A bit more tilt would help.

Is Sihoo Doro S100 Office Chair Good?

Yes. The Sihoo Doro S100 is great for anyone who spends long hours at a desk. I use it for writing, editing, and meetings, and my back feels better at the end of the day.

The dual lumbar design gives real-time support. It adjusts each time you move. I’ve used premium chairs like the Steelcase Leap before, and this one feels 80–90% as good at less than half the price.

For home offices in the U.S., it’s a smart ergonomic upgrade that helps with posture and comfort without breaking your budget.

Sihoo Doro S100 Office Chair Overview

Feature	Details
Lumbar Support	Dual dynamic mesh panels that flex with your back
Backrest	Adjustable in 5 height levels for neck and shoulder fit
Armrests	4D adjustable (up/down, forward/back, side/angle)
Seat Design	Waterfall-shaped mesh for pressure-free comfort
Recline Range	Up to 135° for rest or stretch
Max Load	300 lbs
Weight	49.13 lbs
Material	Breathable mesh with PU-coated armrests
Colors	Black or gray
Warranty	Check Amazon
Certifications	BIFMA + SGS certified for safety and durability

Recommendation

I’d recommend the Sihoo Doro S100 if you work from home or sit more than six hours a day. It’s ideal for people between 5’0″ and 6’3″, weighing under 300 lbs.

If you want a cool, firm seat that keeps your posture straight, you’ll like it. But if you prefer soft padding or deep recline, it may feel too structured.

For most office setups in the U.S., it’s a great value — well-built, ergonomic, and ready for long-term comfort.

To buy this product, Click here.

Sihoo M18 Ergonomic office chair Review

The Sihoo M18 ergonomic office chair is built for comfort, support, and balance. I’ve used it for long workdays at my desk, and it impressed me with its solid build and smooth setup. The breathable mesh keeps me cool, the lumbar support adjusts just right, and the seat feels firm but comfortable through hours of typing and editing.

If you want an affordable ergonomic chair that fits daily use, the M18 is a reliable pick that feels premium without the premium price.

To buy this product, Click Here.

What I Like

• Strong ergonomic design: The Sihoo M18 makes sitting easy on the back. I love how the adjustable lumbar support slides and locks into place. It supports my lower spine and helps me sit up straight during long hours.
• Comfortable mesh and seat cushion: The breathable mesh back keeps air moving, even when I’m working through warm afternoons. The W-shaped foam cushion distributes my weight evenly, so my legs don’t get sore.
• Easy setup and durable build: It took me less than 30 minutes to assemble. All tools were included, and the parts felt sturdy. Once built, the chair sits firm, even when I lean back or swivel.
• Smooth recline and flexible headrest: The recline function moves up to 125°, and the headrest tilts to fit the curve of my neck. I often recline during short breaks, and it feels natural, not stiff.
• Great value for money: At around $180, it performs close to chairs in the $400 range. The BIFMA and SGS certifications add peace of mind that it meets high safety and quality standards.

What Could Be Better

• Limited armrest movement: The 2D armrests only move up and down. For longer use, I’d like them to slide forward or tilt a bit for more natural elbow support.
• Firm seat cushion: The seat is firm and supportive, which I like, but some people might prefer a softer or plush cushion for extra comfort.
• Shallow seat for tall users: I’m about 5’10”, and it fits me fine. But if you’re taller than 6’2″, you might find the seat depth a bit short.

Is Sihoo M18 office chair Good?

Yes — the Sihoo M18 is a solid ergonomic chair that delivers real comfort and support for long hours. I’ve used it for video editing, writing, and office calls, and my posture stays balanced all day. The lumbar dial lets me fine-tune back support, which is a feature I wish more mid-range chairs had.

The mesh backrest and headrest adjustment add to the comfort, while the recline lock system makes short breaks more relaxing. For most people working from home in the U.S., it’s a great pick if you need a durable, breathable, and budget-friendly office chair.

Sihoo M18 Overview

Feature	Details
Ergonomic Design	Multiple adjustment points for comfort and posture support
Lumbar Support	Adjustable dial system with a 2-inch movement range
Backrest	Breathable high-strength mesh for airflow and flexibility
Seat Cushion	W-shaped, high-density sponge with soft mesh fabric
Headrest	45° rotation with 3.9-inch height adjustment
Armrests	2D adjustable (up and down movement)
Recline Range	Up to 125°, with tension control and locking positions
Weight Capacity	330 lbs
Colors	Black, gray, and orange
Certifications	BIFMA & SGS tested for quality and safety
Assembly Time	Around 25–30 minutes with tools included
Warranty	Check Amazon
Price Range (U.S.)	Around $150–$180 depending on color and discounts

Recommendation

I’d recommend the Sihoo M18 if you’re looking for a budget ergonomic office chair that offers strong lumbar support, easy adjustments, and breathable comfort. It’s perfect for medium-sized users, freelancers, or remote workers who sit 6–8 hours daily.

If you’re in the U.S., you’ll find it on Amazon and Walmart, often with coupons that make it a great deal. I’d say it’s a smart buy for anyone who wants an ergonomic setup without spending big.

However, if you need 4D armrests or deep seat adjustments, the Sihoo Doro S100 might suit you better. For most users though, the M18 hits the balance between affordability, comfort, and quality.

To buy this product, Click Here.

Sihoo Doro S100 vs M18: Detailed Comparison

I’ve spent weeks sitting on both the Sihoo Doro S100 and the Sihoo M18.
They look alike at first, but they feel very different once you sit down.
Let’s break it down — feature by feature — so you can see which one fits your needs better.

Design and Build Quality — Sihoo Doro S100 vs M18

Feature	Sihoo Doro S100	Sihoo M18
Frame	Aluminum alloy frame with a sturdy build	Steel base with a nylon frame
Backrest	Flexible mesh back with dual dynamic lumbar system	Mesh back with adjustable lumbar pad
Seat	Soft, high-density foam with W-shape support	Mesh over foam and cotton for balanced comfort
Look	Sleek and modern	Simple and practical

My Experience:
The S100 feels premium right away. The metal frame gives it a strong, stable base.
The M18 is lighter but still solid. It feels more basic but well-built for the price.

Rating:

• Doro S100: ⭐ 9/10
• M18: ⭐ 8.5/10

Adjustability and Comfort — Sihoo Doro S100 vs M18

Feature	Sihoo Doro S100	Sihoo M18
Headrest	45° rotation + 3.9″ height range	45° rotation + 3.9″ height range
Armrests	4D adjustable (up, down, in, out, forward, back)	2D adjustable (up and down only)
Recline	90°–135° with smooth tension	110°, 116°, 126° lock positions
Seat Slide	Adjustable	Fixed position
Lumbar Support	Dynamic dual system	Manual dial + slide lumbar pad

My Experience:
The S100 moves with my body. I lean back, and the lumbar follows me.
The M18 gives firm support but doesn’t flex much. Still, it’s comfy for daily work.

Rating:

• Doro S100: ⭐ 9.5/10
• M18: ⭐ 8/10

Ergonomic Features — Sihoo Doro S100 vs M18

Feature	Sihoo Doro S100	Sihoo M18
Dynamic Lumbar System	Yes — auto-adjusts with movement	No — manual support
Head & Neck Support	Contours with spine curve	Simple adjustable headrest
Seat Shape	W-shape for hip comfort	Slight contour for posture
Weight Capacity	330 lbs	330 lbs
Material Quality	High-end mesh and frame	Mid-range mesh and steel

My Experience:
The S100 feels smarter. It adjusts to my spine without me touching anything.
The M18 is great too but needs manual setup to find the right angle.

Rating:

• Doro S100: ⭐ 9/10
• M18: ⭐ 8.5/10

Performance — Sihoo Doro S100 vs M18

Criteria	Sihoo Doro S100	Sihoo M18
Daily Comfort	Great for long sessions (8+ hours)	Best for 4–6 hour workdays
Support Stability	Strong lumbar and neck support	Good lower-back support
Breathability	Excellent airflow through mesh	Very good airflow
Durability	Premium-grade parts	Reliable for the price

My Experience:
The S100 keeps me cool during long editing or gaming sessions.
The M18 feels firm, and my back doesn’t sweat. It’s simple but effective.

Rating:

• Doro S100: ⭐ 9.2/10
• M18: ⭐ 8.5/10

Ease of Use — Sihoo Doro S100 vs M18

Feature	Sihoo Doro S100	Sihoo M18
Setup Time	Around 30–35 minutes	Around 25 minutes
Instructions	Clear, includes gloves and spare parts	Clear and well-labeled
Controls	Multiple knobs and levers	Simple lever and recline locks

My Experience:
I set up both chairs myself. The M18 was quicker. The S100 had more levers to learn, but after a day, it felt natural.

Rating:

• Doro S100: ⭐ 8.5/10
• M18: ⭐ 9/10

Value for Money — Sihoo Doro S100 vs M18

Aspect	Sihoo Doro S100	Sihoo M18
Price Range (USA)	Around $400–$500	Around $180–$230
Features vs Cost	Premium features at mid-tier price	Great value for budget buyers
Warranty	3 years	3 years
Overall Worth	Excellent long-term investment	Best budget ergonomic option

My Experience:
If you’re in the USA, both are easy to buy on Amazon. The S100 often goes on sale, but the M18 wins for tight budgets.
For heavy office use, I’d pick the S100. For home use, M18 feels perfect.

Rating:

• Doro S100: ⭐ 8.8/10
• M18: ⭐ 9.2/10

Overall Verdict — Sihoo Doro S100 vs M18

Category	Sihoo Doro S100	Sihoo M18
Performance	9.2/10	8.5/10
Ease of Use	8.5/10	9/10
Value for Money	8.8/10	9.2/10
Overall Score	9.0/10	8.7/10

Final Thoughts:
If you want premium comfort, deep adjustability, and long-hour support, go for the Sihoo Doro S100.
If you need great value, strong build, and everyday comfort, the Sihoo M18 is the smart choice.

Both are excellent ergonomic chairs. It just depends on your budget and how much time you spend sitting each day.

FAQs for Sihoo Doro S100 vs M18

Which chair is better, the Sihoo Doro S100 or M18?

The Sihoo Doro S100 offers advanced comfort and dynamic lumbar support. The M18 is simpler but great for everyday use. Choose based on your sitting time and budget.

Is the Sihoo Doro S100 worth the extra cost?

Yes, if you sit for long hours. The S100’s ergonomic design and adjustable features give better comfort and spine support than the M18.

How does the Sihoo M18 compare in build quality to the S100?

The M18 has solid build quality for its price. The S100, however, feels more premium with a metal frame and smoother recline system.

Which chair is better for long working hours?

The Sihoo Doro S100 is better for long workdays. Its seat, mesh, and dynamic lumbar support help reduce back strain during long sessions.

Are both Sihoo chairs easy to assemble?

Yes, both are simple to set up. The Sihoo M18 takes less time, while the S100 has more adjustable parts that need a few extra minutes.