SIHOO M59AS review: strong ergonomics at its lowest-ever price

Is the SIHOO M59AS worth buying? Yes — at £239.99, its all-time-low price, this is a well-specced ergonomic chair with 3D coordinated armrests, a dual-back design, adaptive lumbar support, and a 4.2/5 rating from 373 reviews.

First impressions

The M59AS is aimed squarely at people who want adjustability without moving into premium-chair pricing. The headline features are practical rather than flashy: 3D coordinated armrests, 80° flip-up arms, a double-back structure, an adaptive lumbar pillow, and a saddle-shaped cushion. That combination suggests a chair built for long desk sessions rather than occasional use.

What do the key features actually do?

The 3D coordinated armrests are the most immediately useful feature on paper because they move front-to-back and left-to-right, while the linkage design allows the arms to work with the chair rather than feel like an isolated add-on. The 80° flip-up armrests are also genuinely helpful if you use a compact desk, need to slide the chair fully in, or switch between typing and freer movement.

The double back design and adaptive lumbar pillow are the core ergonomic selling points. A split-back layout can help the chair follow the shape of the spine more naturally than a flat backrest, and the adjustable lumbar element should help users who need lower-back support during long sessions. The saddle-shaped cushion is another sensible detail: it is designed to follow the curve of the buttocks and legs, which should reduce pressure compared with a flat seat.

How does it perform for all-day work?

For a 10-hour desk day, the M59AS looks better suited to mixed sitting positions than to rigid upright posture. The armrest movement and flip-up design should help you shift position more often, which is important for comfort over time. The mesh construction is also a plus for UK home offices that can get warm, and the chair has been certified by BIFMA and SGS and passed a 1136 kg hydrostatic pressure test, which is reassuring from a durability and safety perspective.

The main limitation is that the listing data does not give a full adjustment sheet, so buyers should not assume it matches higher-end chairs on seat depth, recline range, or fine-tuned lumbar travel. The chair may feel excellent for average-sized users, but anyone with very specific ergonomic needs should check dimensions carefully before buying.

Is the build quality good enough?

On the available data, yes. BIFMA and SGS certification, plus the 1136 kg pressure test, point to a chair that has been built with more seriousness than many budget mesh models. The 4.2/5 rating across 373 reviews also suggests the chair is broadly meeting expectations, even if it is not universally loved.

Is it good value for money?

At £239.99, the M59AS sits in a competitive middle ground. It is more expensive than the CLOUVOU CleverSeat at £219.99 and less expensive than the SIHOO Doro C300 at £269.97. Against the cheaper CLOUVOU, the SIHOO does not win on rating — the CLOUVOU is 4.8★ — so value depends on whether you prioritise rating or the M59AS’s specific ergonomic features. Against the Doro C300, the M59AS looks like the more affordable option, but the C300’s higher price may buy a more refined experience.

How does the SIHOO M59AS compare to alternatives?

Compared with the SIHOO Ergonomic Office Chair Mesh Desk Chair at £233.01 and 4.3★, the M59AS is slightly pricier and slightly lower rated, so the decision likely comes down to feature preference rather than obvious superiority. If you want the best-reviewed option in this group, the CLOUVOU CleverSeat leads on rating and price. If you want a more premium SIHOO model, the Doro C300 is the step up at £269.97.

Final assessment

The M59AS is a sensible buy for anyone who values adjustable armrests, a supportive back design, and a mesh chair that should handle long work sessions without feeling basic. It is not the cheapest option and it does not lead this group on review score, but the feature set is well chosen and the current price is unusually attractive.

The one caution is simple: if you want the highest-rated chair for the money, the CLOUVOU looks stronger on paper. If you want a mid-priced ergonomic chair with more advanced armrest and lumbar features, the SIHOO M59AS is easy to justify.