I've only had it a week but so far I am in love with this chair. I am petite and have occasional sciatica (numbness pain) in my left leg so it has been very challenging to find a chair that is really comfortable over long periods of time. This one so far is great! Everything (back tilt lower back support seat height arm positioning) is adjustable and the back gives me great support. I like that the seat comes up higher than many other chairs so I don't feel like a small child at my desk but am actually up high enough. I didn't install the headrest so can't comment on that. I did struggle a bit putting it together at first - after getting help from my husband it took around 30 minutes.
The chair seemed comfortable until I sat up straight. Then the headrest hit me in the shoulders. I'm somewhat tall for a woman (5-9) but most men would be taller than me. Likely a good chair if you're closer to 5 foot or don't tend to sit up tall.
Comfortable Back Supportive like the idea of the weightless mesh. I am 6'2" so I wish the head rest contoured to my neck a little more without having to lean so far back but keeping an open mind that it wasn't custom made for my body frame but I'm sure it's close enough for the majority of shapes and sizes so all in all I am very happy with it and the price point although it is a little on the high side..