These three keep appearing against each other in the same price band, the listings quote different specifications so nothing lines up, and the reviews all sound identical.
Picked on published fit specifications, not on hands-on testing. How we pick.
The short answer
The Sihoo Doro C300 is the one to buy: it is the only one of the three that publishes both seat depth adjustment and a height-adjustable backrest, which are the two controls that decide whether a budget chair fits you. The Hbada E3 Pro wins on seat width and is the only one publishing a fit range. The M57 is the cheapest.
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Ranked picks with published seat height, seat depth and weight capacity
#
Product
Best for
Seat height
Capacity
Price
1
Sihoo Doro C300
Seat depth adjustment plus a backrest that moves 3.5 inches
#ad Seat height and capacity are the manufacturer's published figures, sourced under each pick. We do not publish prices — each button opens the current price on the retailer's own page. Seat depth for every pick is in the spec block below. Seat depth summary: Sihoo Doro C300 18.11" · Hbada E3 Pro 1.97" · Sihoo M57 18.11"
Every published figure, side by side
This is the table the three listings do not let you build, because each maker publishes a different subset of specifications. Where a figure is absent below, it is absent from the manufacturer's own specification table - we have not estimated it, and we have not converted one measurement into another.
Published specifications for all three chairs, as stated by the manufacturer
Specification
Sihoo Doro C300
Hbada E3 Pro
Sihoo M57
Seat height from floor
Not published
Not published
Not published
Overall chair height
42-49 in
43.7-51.8 in
42-49 in
Seat depth
18.11 in
1.97 in (cushion thickness)
18.11 in
Seat depth adjustment
Yes (range not published)
Not published
Not published
Seat width
20.28 in
25.6 in
20.08 in
Backrest height
18.11-21.65 in (adjustable)
3.15 in of height adjustment
Not published
Lumbar
Self-adapting dynamic lumbar
Three-zone dynamic lumbar
Adjustable lumbar support
Weight capacity
330 lb
330 lb
330 lb
Stated fit range
Not published
5 ft 1 in to 6 ft 5 in
Not published
Warranty
3-year
5-year base, gas lift, casters; 3-year other components
3-year
What the table actually tells you
Three things, and they are more useful than any of the individual numbers.
None of the three publishes a seat height from the floor. All three give you overall chair height instead, which is the distance from the floor to the top of the headrest and tells you nothing about where your legs will be. This is standard practice at this price point and it is the single biggest limitation of buying in this band: you cannot confirm the most important fit number before the chair arrives. Our seat height guide explains why that number matters more than any other, and the footrest page covers the contingency plan if it lands too high.
Only the C300 publishes depth adjustment. Both Sihoo chairs list an 18.11-inch pan, and 18.11 inches is longer than many people's thighs - which means the front edge presses behind the knee and you end up perched forward off the backrest. The C300 can be adjusted out of that; the M57 cannot. That single difference is why they are not interchangeable despite near-identical spec sheets.
The Hbada depth figure is not a pan length. Hbada publishes 1.97 inches under the heading seat depth, which is plainly a cushion thickness. We print it as published and flag it rather than quietly substituting a number we would have to invent. The practical consequence is the same as an absent figure: you cannot compare its pan length to the others.
Which one, by what you need
Choosing between the three on published figures
If your problem is...
Buy
Because
The seat edge presses behind your knees
Sihoo Doro C300
The only one publishing seat depth adjustment
Your back support lands too low or too high
Sihoo Doro C300
Backrest moves through 18.11-21.65 in of height
Your hips meet the sides of the seat
Hbada E3 Pro
25.6 in of published seat width, the widest in our registry
You want the longest cover on the parts that fail
Hbada E3 Pro
5 years on base, gas lift and casters - these are the parts that go
You want the lowest price with a real capacity rating
Sihoo M57
330 lb and a 3-year warranty at the cheapest price here
You need a confirmed seat height before ordering
None of them
No maker here publishes one - look at the Steelcase Series 1 instead
That last row is not a cop-out, it is the honest answer. If you are short, or tall, or you already know from experience that standard chairs sit too high for you, none of these three can be verified before purchase. The Steelcase Series 1 publishes 16.5 to 21.5 inches and a 15.5 to 17.75 inch functional depth at a higher but not premium price - best office chairs under $500 covers that band, and what you get at each price tier explains what the extra money buys.
Our verdict
Buy the Sihoo Doro C300 unless you specifically need the width. The reasoning is narrow and we will state it plainly: in this price band the thing that decides whether a chair works for you is how much of it you can change, and the C300 is the only one of the three that lets you change the two dimensions most likely to be wrong - pan length and back support height. The M57's spec sheet looks close to it and is materially less adjustable. The E3 Pro beats both on width and on warranty structure, and if your hips need 25.6 inches that outranks everything else on this page.
The winner of this three-way, and on a specific basis rather than a general impression: it is the only one of the three that publishes seat depth adjustment and the only one with a height-adjustable backrest. Those are the two controls that decide whether a chair can be made to fit a particular body, and in this price band they are rare. Sihoo publishes an 18.11-inch pan with depth adjustment, a backrest moving through 18.11 to 21.65 inches, a 20.28-inch seat width, a self-adapting dynamic lumbar, a 330-pound rating and a three-year warranty. What it does not publish is a seat height from the floor - only an overall chair height of 42 to 49 inches, which is the one real gap.
Who it fits
Anyone whose current chair presses behind the knees or whose back support lands in the wrong place.
Who it does not fit
Anyone over 330 lb, and anyone who needs a confirmed seat height before ordering.
2. Best for Width, and a maker willing to state who it fits
Hbada E3 Pro
Two things set this apart. It publishes the widest seat in our entire registry at 25.6 inches, which matters if your hips meet the bolsters of a standard pan. And Hbada is the only one of these three - and one of very few budget makers anywhere - that publishes a fit range at all, claiming 5 ft 1 in to 6 ft 5 in. Also published: a three-zone dynamic lumbar with 3.15 inches of backrest height adjustment, a 330-pound rating, and five years on the base, gas lift and casters with three years on other components, which is the best warranty structure here. Read one figure carefully: the published seat depth of 1.97 inches is a cushion thickness, not a pan length, so pan depth is unknown.
Who it fits
Anyone who needs a wide pan, and anyone who wants a maker's own fit claim to check against.
Who it does not fit
Anyone over 330 lb, and anyone who needs to know the pan depth before buying - Hbada does not publish it.
Published specifications
Overall height
43.7"–51.8" (seat height not published)
Seat depth
1.97"
Seat width
25.6"
Weight capacity
330 lb
Lumbar
Three-zone dynamic lumbar, 3.15 in of backrest height adjustment
Maker's fit range
5 ft 1 in to 6 ft 5 in, per Hbada
Warranty
5-year on base, gas lift and casters; 3-year on other components
The entry point, and an honest one: Sihoo publishes a 330-pound rating and a three-year warranty on the cheapest chair on this site, which is a better structural specification than the price suggests. It also publishes an 18.11-inch seat depth, a 20.08-inch seat width and adjustable lumbar support. What you give up relative to the C300 is the two things this comparison turns on - there is no published seat depth adjustment and no backrest height adjustment - so this is a chair you fit yourself to rather than one you adjust to fit. Like the C300 it publishes overall height of 42 to 49 inches and no seat height.
Who it fits
Anyone on the tightest budget who happens to suit a standard 18-inch pan.
Who it does not fit
Anyone who needs depth or backrest-height adjustment, and anyone over 330 lb.
Is the Sihoo Doro C300 better than the Hbada E3 Pro?+
For most people, yes - the C300 is the only one of the two that publishes seat depth adjustment and a height-adjustable backrest, which are the controls that let a chair be fitted to you. The E3 Pro wins if you need width: Hbada publishes 25.6 inches of seat width against the C300's 20.28 inches.
What is the difference between the Sihoo M57 and the Doro C300?+
Both publish an 18.11-inch pan, a 330-pound rating and a three-year warranty, so the spec sheets look close. The difference is adjustability: the C300 publishes seat depth adjustment and a backrest that moves through 18.11 to 21.65 inches of height, and the M57 publishes neither.
Do any of these publish a seat height?+
No. All three publish overall chair height - 42 to 49 inches for both Sihoo models, 43.7 to 51.8 inches for the Hbada - which is floor to headrest and tells you nothing about where your legs will sit. That is the main limitation of this price band.
Why does Hbada list a 1.97-inch seat depth?+
Because it is publishing a cushion thickness under that heading rather than a pan length. We print the figure as published and flag what it is, rather than substituting a number we would have to invent - which means pan depth for the E3 Pro is effectively unknown.
Should I spend more than this?+
If you are short, tall, or have already found that standard chairs sit too high, yes - because none of these three publishes a seat height you can check before ordering. The Steelcase Series 1 publishes 16.5 to 21.5 inches and a 15.5 to 17.75 inch functional seat depth, which is the cheapest chair in our registry where both are verifiable.
