I'm 5'7" 160 lbs. It fits me perfectly and feels really comfortable. However I give it 4 stars because the headrest needs to be more adjustable. I got this chair for the guy who works for me 6' 190 lbs. The headrest was pressing the back of his shoulder even after he pull it all the way up.
The contouring of this chair fits me well. It is comfortable. If one has to spend long periods of time in this char the mesh is very ventilation friendly. Equally important is the regular updates which Staples furnished in the time between purchase and delivery. Well done!
Really good chair my only complaint is the head rest. I am on the taller side so the headrest sits too low. You can fix this however by taking it off and removing the two phillips head screws in it then flipping the arm around and reinstalling it. Its a pain to do because the screws are inside the headrest and you have to get an L-shape wrench in there to get them out but its worth the effort. Other than that the chair is fantastic.
Compared this with $1 500 chairs and prefer it to all 15 other chairs we ever had around here and it costs 1/10th the price. Out of 9 chairs two of them had the gas cylinders go bad but Staples go them immediately replaced for free under warranty. The warranty is 7 years.