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Home & DecorAugust 23, 2026Updated August 23, 20269 min read

SIHOO M57 vs FlexiSpot ErgoX: Which Mesh Chair Should You Buy?

Our two most purchased chairs, compared feature by feature with verified prices. The M57 wins for most people by about $110; the ErgoX wins for anyone who reclines, with a flexing lumbar, a locking recline, and a footrest. Plus the Steelcase Series 1 as the step up if neither feels like a ten-year chair.

By Justin Park · How we research

★ Our Top Pick

SIHOO M57 Ergonomic Mesh Office Chair

SIHOO M57 Ergonomic Mesh Office Chair

Same mesh, 3D arms, and headrest for about $110 less. Best for upright work.

$189.96rated 4.5/5 in our review
Check the SIHOO M57 on Amazon →Read the full review ↓

The Challenger

FlexiSpot ErgoX

$299.99 →

The Step Up

Steelcase Series 1

$499.00 →

Not sure yet? Compare all 3 picks below ↓

Buy the SIHOO M57 for most people. It costs $189.96 at the time of writing, about $110 less than the FlexiSpot ErgoX at $299.99, and it matches the ErgoX on the mesh back, the 3D armrests, and the adjustable headrest. Buy the ErgoX if you recline during the day: its lumbar flexes with your back, its recline locks in reclined positions, and it has a flip-out footrest the M57 does not. Those are the two most purchased chairs we cover, and the question of which to buy lands in our inbox weekly, so here is the full comparison.

What surprises most people is how much the two share. Both are mesh chairs with the same class of frame, the same 3D arm set, the same headrest idea, and the same seat height range. The ErgoX's extra $110 buys mechanism, not materials: better lumbar, better recline, a footrest. If you sit upright and work, you are buying features you will not use. If you lean back to read, think, or take calls, you are buying exactly the features that matter.

Both chairs rank in our best office chairs guide and our best mesh office chairs guide. Below: the head-to-head, the full spec table, who should buy which by the kind of work they do, and the Steelcase Series 1 as the step up if neither feels like a ten-year chair. Every product link goes to Amazon with our affiliate tag; we earn a small commission, at no cost to you, when you buy through us.

Winner for Most PeopleOur Pick
SIHOO M57 Ergonomic Mesh Office Chair by SIHOO

SIHOO M57 Ergonomic Mesh Office Chair

SIHOO$189.96
4.5
Check the SIHOO M57 on Amazon →

Available at Amazon

Back

Mesh, height-adjustable lumbar pad

Armrests

3D (height, depth, pivot)

Headrest

Adjustable height and angle

Recline

Tilt with lock, about 120 deg per listing

Weight rating

330 lb per listing

Footrest

None

Pros

  • About $110 cheaper than the ErgoX
  • Same 3D arms, mesh back, and adjustable headrest
  • Listed 330 lb rating
  • Fits under a desk with no footrest bulk

Cons

  • Fixed-depth lumbar pad
  • Tilt only, no locking recline
  • No footrest

Line the two chairs up on the adjustments that matter for eight hours of upright work and they tie. Both have 3D armrests that move in height, depth, and pivot, which is the single adjustment that lets you pull in close to the desk with your forearms supported. Both have a mesh back and an adjustable headrest. Both have a seat height range that covers roughly 5 ft 4 in to 6 ft 2 in. On those, the M57 at $189.96 at the time of writing and the ErgoX at $299.99 are the same chair.

The M57 loses on two things and does not pretend otherwise. Its lumbar support is a pad you position on a track; it stays where you set it. And its tilt rocks back against a tension spring and locks upright, which is fine for a thirty-second stretch and wrong for a thirty-minute read. If you sit up and work, neither limit will register. Our full SIHOO M57 review goes deeper on fit, assembly, and the M18 alternative.

Our Pick

The M57 wins this comparison for most people because it matches the ErgoX on every adjustment that matters for upright work and costs about $110 less at the time of writing. Mesh back, 3D armrests, adjustable headrest, height-adjustable lumbar pad, and a listed 330 lb rating. It is the most purchased chair we cover.

Buy the M57 if your day is mostly upright: typing, drawing, editing, spreadsheets. Buy it if you sit at a desk without much floor space in front of the chair. Buy it if $110 matters, which for a chair purchase it usually does.

What we don't like

The lumbar is a pad on a track rather than a section that flexes with you, and the tilt is a tilt, not a recline that locks in a reclined position. Those are precisely the two things the ErgoX does better, and if they matter to you the M57 is the wrong chair.

Check the SIHOO M57 on Amazon →$189.96 · SIHOO
Winner for Long Reclined SessionsThe Challenger
FlexiSpot ErgoX Premium Ergonomic Office Chair with Footrest by FlexiSpot

FlexiSpot ErgoX Premium Ergonomic Office Chair with Footrest

FlexiSpot$299.99
4.5
Check the FlexiSpot ErgoX on Amazon →

Available at Amazon

Back

Mesh with dynamic lumbar

Armrests

3D (height, depth, pivot)

Headrest

Adjustable

Recline

Multi-position with lock, per listing

Footrest

Flip-out, stows under seat

Weight capacity

See listing; not independently verified

Pros

  • Dynamic lumbar that flexes with your back
  • Recline that locks in reclined positions
  • Flip-out footrest that disappears when stowed
  • Creator Connections enrolled, frequent coupons

Cons

  • About $110 more than the M57
  • Same build class despite the price
  • Footrest needs floor space in front of the chair

The ErgoX's case is simple: it fixes the M57's two weaknesses and adds a footrest. The dynamic lumbar is the part people notice first. Lean forward to draw and it follows; lean back to think and it follows. On the M57 you would re-position the pad or live with the gap. The recline is the second part: it locks reclined, so a long call or a read through a contract happens with your back supported instead of with your core holding you at a tilt.

The footrest is the part that makes the ErgoX a different category of chair, and the part that makes it wrong for some desks. It flips out from under the seat and extends, and it is excellent for a twenty-minute break. It also needs about two feet of floor in front of the chair, which a low modesty panel or a cramped cubicle eliminates. Our full FlexiSpot ErgoX review covers the footrest, capacity, and the cheaper OC3 in detail.

The Challenger

The ErgoX wins when you lean back. Its lumbar flexes with your spine instead of sitting fixed, its recline locks in multiple positions, and a flip-out footrest stows under the seat. For about $110 more at the time of writing, it turns the M57's upright formula into a chair for long, varied sessions. It is the second most purchased chair we cover.

Buy the ErgoX if you recline to read, think, or take calls for meaningful stretches of the day, if a fixed lumbar pad has never fit your back, or if you want an afternoon break with your feet up without leaving the desk.

What we don't like

The $110 premium buys mechanism, not materials: the frame class is the same as the M57. The footrest adds bulk under the seat and needs about two feet of clear floor. And if you never recline, every one of its advantages goes unused.

Check the FlexiSpot ErgoX on Amazon →$299.99 · FlexiSpot

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The Step Up If Neither
Steelcase Series 1 Office Chair by Steelcase

Steelcase Series 1 Office Chair

Steelcase$499.00
4.7
Check the Steelcase Series 1 on Amazon →

Available at Amazon

Back

LiveBack flexing back

Recline

Weight-activated

Weight rating

400 lb

Headrest

None standard

Warranty

Steelcase multi-year

Pros

  • Weight-activated recline, no tension knob
  • LiveBack flexes with the whole spine
  • 400 lb rating and a real warranty
  • Parts availability budget brands cannot match

Cons

  • About $200 more than the ErgoX
  • No footrest or standard headrest
  • Arm configuration varies by listing

The Series 1 is what both budget chairs are imitating. Its back flexes as a unit, which does what the ErgoX's dynamic lumbar does and more, and the recline responds to your body weight with no knob to dial. The trade is the footrest and the headrest, neither of which is standard. If the Steelcase price is in reach, it is the chair to buy once. We compare it with its bigger sibling in Series 1 vs Series 2, and rank it against the full field in our best office chairs guide.

If you read both cases above and neither feels like a chair you would own for ten years, this is the one. Weight-activated recline, Steelcase's LiveBack flexing back, a 400 lb rating, and a manufacturer with a warranty department. At $499 at the time of writing it is about $200 more than the ErgoX and about $309 more than the M57.

Buy the Series 1 if you want to buy once, if you need the 400 lb rating, or if you want the flexing back without the footrest bulk. It is the chair we would buy with our own money if the budget allows.

What we don't like

No footrest, no headrest standard, and 4D arms depend on the configuration in the listing. It is a lighter, smaller-feeling chair than the price implies.

Check the Steelcase Series 1 on Amazon →$499.00 · Steelcase

Head-to-Head

How the top picks compare

One matchup, one verdict: the M57 for most people, the ErgoX for anyone who reclines.

SIHOO M57 vs FlexiSpot ErgoX

Same mesh and 3D arms; the ErgoX adds dynamic lumbar, a locking recline, and a footrest for about $110 more.

SIHOO M57

SIHOO

Winner

SIHOO M57

The same upright-work adjustments for about $110 less

$189.96
Check Price →
FlexiSpot ErgoX

FlexiSpot

FlexiSpot ErgoX

Dynamic lumbar, locking recline, and a flip-out footrest

$299.99
Check Price →

Our verdict

Winner: SIHOO SIHOO M57. The M57 wins for most people. On every adjustment that matters for upright work, mesh back, 3D arms, adjustable headrest, seat range, the two chairs tie, and the M57 costs about $110 less at the time of writing. The ErgoX's three advantages, a lumbar that flexes with you, a recline that locks reclined, and a footrest, are real and worth the money only if you lean back for meaningful stretches of the day.

Buy the SIHOO

Buy the M57 if you sit upright and work, your desk has little floor space in front of the chair, or $110 matters.

Buy the FlexiSpot

Buy the ErgoX if you read, think, or take calls leaning back, if a fixed lumbar pad has never fit you, or if you want an afternoon break with your feet up.

How we
chose

A comparison page is only useful if it actually picks, so here is how we reached this verdict:

  • Feature-by-feature, not vibes. We listed every adjustment on both chairs and marked each row as a tie or an edge. The ErgoX wins three rows; the M57 wins two. The rest tie. The verdict follows from which rows describe your day.
  • Price as a feature. $110 is the ErgoX's biggest cost, and it belongs in the table. A chair that matches on upright work for $110 less is the better chair for upright work.
  • Use cases, not personas. We mapped the two chairs against the actual kinds of desk work our readers do: drawing, writing, calls, cramped desks, heavier users, back pain. Each gets a direct answer.
  • Manufacturer claims stated as claims. Weight ratings and recline angles come from the listings. We cannot load-test a chair and we say so. Where margin matters, we point to the Steelcase Series 1's 400 lb rating.
  • Verified listings only. Every price on this page was checked against the live Amazon listing on the day of publication. The ErgoX frequently carries a coupon, so check the live page before assuming the gap is exactly $110.

Quick Shop

All Products at a Glance

Every product in this guide, with direct links to current prices.

1SIHOO M57 Ergonomic Mesh Office ChairWinner for Most People · SIHOO$189.96Shop on Amazon →2FlexiSpot ErgoX Premium Ergonomic Office Chair with FootrestWinner for Long Reclined Sessions · FlexiSpot$299.99Shop on Amazon →3Steelcase Series 1 Office ChairThe Step Up If Neither · Steelcase$499.00Shop on Amazon →

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