Hbada E3 Ultra Ergonomic Office Chair
A big-and-tall ergonomic chair that undercuts the Sihoo Doro C300 by hundreds of dollars without giving up the headline features.
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What we like
- 3-zone dynamic lumbar adjusts independently for upper, mid, and lower back
- 360° mechanical armrests pivot in directions most chairs can't match
- Aluminum alloy base feels far more premium than the price suggests
- Big-and-tall sizing comfortably handles users up to 6'4" / 300 lbs
Could be better
- Assembly takes 45+ minutes and the instructions are mediocre
- Mesh is firm — fans of plush cushioning should look elsewhere
- Brand support is improving but still not Herman Miller territory
Full Review
Hbada has spent 2026 quietly turning into the brand to beat in sub-$500 ergonomic seating. The E3 Ultra is the big-and-tall version of the E3 Pro, and it’s the model that most directly targets the Sihoo Doro C300 — at roughly half the price.
Build Quality
The aluminum alloy base is the giveaway that Hbada took this one seriously. Most chairs at $399 ship with nylon bases that creak inside a year; the Ultra’s polished aluminum doesn’t flex when you lean into it, and it gives the chair a planted, solid feel during recline. The mesh on the seat and back is taut without being abrasive, and the frame has zero noticeable wobble after a few weeks of daily use.
The 3-Zone Lumbar Is the Real Story
Most “ergonomic” chairs slap a single lumbar pad on the backrest and call it done. The E3 Ultra splits support into three independently adjustable zones — upper, mid, and lower back — that respond dynamically as you shift. It’s the same idea Sihoo uses on the Doro C300, and the execution here is genuinely close. Dial it in once and your back stops asking for breaks at hour four.
Adjustability
The 360° mechanical armrests are unusual. Beyond the standard 4D motion, they rotate around the seat axis — useful if you do a lot of side work like writing on a notepad or controlling a second keyboard. The 4D headrest moves up, down, forward, back, and tilts. The recline goes to 135° with tension control, which is plenty for a midday decompression but stops short of a full nap angle.
How It Compares
Against the Sihoo Doro C300 ($800+), the Ultra gives up some refinement in the recline mechanism and a bit of polish in the seat foam, but matches the headline features. Against the Branch Ergonomic Chair Pro ($600+), the Ultra is more adjustable but less plush. Against the Flexispot BS11, the Ultra feels noticeably more premium and supports heavier users more confidently.
Who Should Buy This
Buy the E3 Ultra if you’re 5’10” or taller, want serious ergonomic adjustability, and refuse to pay $800+ for a Doro C300. It’s also the right call if you specifically need the higher weight capacity or the wider seat pan. Skip it if you want plush cushioning, prefer leather, or need a chair that arrives fully assembled — this one will eat 45 minutes of your Saturday.
