I've had this chair for 4 years but this issue started within the first 2 years of purchase. There is a cushion underneath the front edge of the chair that has been giving me problems. It continuously slides out of place causing the back of my thighs to sit on plastic. I have to reach under the chair and pull in back in place several times a week. It seems to only be held in place by a couple of thin pieces of plastic that are not doing the job. I'm a frugal person but I'm finally fed up and going to get rid of the chair.
I am 5'-11" and 210 lbs. Easy assembly. Well written instructions (included or online). Purchased this chair 4 two reasons: 1-Lumbar support 2- Head support. This chair rolls very smoothly on mat. Very comfortable! Headrest is wonderful. Lumbar support is wonderful. I spend 8-10 comfortable hours a day in this chair. Lots of bang for the buck. No regrets buying this chair!
This chair is the most comfortable chair I have sat in for extended periods of time (6-8 hrs). You want a mesh bottom seat like this chair has. Much better than the cheaper padded cushion with plywood options out there.