Sihoo M18 Ergonomic Chair

Pros

• +Unbeatable feature set at this price — lumbar and 3D arms together is rare under $200
• +Assembly takes 20 minutes with no tools beyond what's in the box
• +Lumbar support actually works — not a cosmetic plastic pad
• +Mesh back stays cool through long sessions
• +Adjustable lumbar support

Cons

• −Seat padding compresses noticeably after 12–18 months of daily use
• −Plastic parts feel cheap compared with premium-tier chairs
• −Limited size adjustability — best for 5'4"–6'0" range
• −Not the cheapest option in the category