FWIW, I have the regular Ergonomic chair, I've used it for a year now and probably average 60-80 hours a week in the thing for a year straight (medical grad student lol). I did end up taking the arm rests off because I felt they weren't doing anything for me other than allowing me to get up closer to my desk. Aside from that though, the cushion is still holding up, there's a slight creak when returning from the reclined to the upright position, but nothing when the seat back is locked, and nothing has fallen apart.
Praise

.webp)