Bought it couple of weeks ago. I just wish back lumbar piece would have better adjustment for the lower back. Head piece is also limited on adjustment. Overall I'm satisfied. I use it for about 8 hours daily and no back aches like I used to have with my prior chair.
The Hyken chair is fine but after sitting in it for about an hour I noticed that my sciatic nerve starting bothering me which it usually doesn't. The front of the chair hits the back of my legs in such a way that it causes a problem. The box was already gone in the garbage so we're left with a chair that no on in the house is using.