X-Chair X1 vs SIHOO M18

Side by side from official specifications, sourced prices and User Insights. No written comparison exists for this pair yet.

X-Chair

X-Chair X1

$729

SIHOO

SIHOO M18

$289.99 – $299.99

$439.01

lower starting price for SIHOO M18 than X-Chair X1 at the brand stores

Differences at a glance

X-Chair X1SIHOO M18

Price: $729$289.99 – $299.99
Seat height: 15.56–19.75 in44–54 cm
Seat depth: 16–18 in17.91 in (≈ 45.5 cm)
Load capacity: 275 lb (125 kg)330 lb (≈ 150 kg)
Recline: Extensive Variable Recline allows you to recline and lock into position. Recline tension can be adjusted using one tension-resistant control.Maximum 126° recline angle
Arms: 4-Dimensional armrests come standard (up, down, side-to-side, front-to-back); option to upgrade to FS 360 rotational armrests; Armrest Height 7.125in - 10.625inAdjustable armrests (Up and down)
Headrest: Optional add-on (standard configuration: No headrest; Headrest +$60)Headrest moves 3.9" up and down and pivots 45°
Lumbar support: Dynamic Variable Lumbar (DVL)® Support; height adjustable backrest raises the DVL®Lumbar support adjusts vertically and horizontally
Warranty: 5 years (all parts and materials); 15 years (non-moving metal components, chair frame)3 years

Which is cheaper, the X-Chair X1 or the SIHOO M18?

The SIHOO M18 is cheaper to start: $289.99 versus $729 for the X-Chair X1 at the brand stores (Sep 2026).

Which has a higher weight capacity?

The SIHOO M18, rated for 330 lb versus 275 lb for the X-Chair X1.

Which has a headrest?

Both: the X-Chair X1 as an option and the SIHOO M18 as standard.

What do owners mention most?

Price and value for the X-Chair X1, and price and value for the SIHOO M18, based on review summaries.