I have sat in an office chair for about 45 years and this is the best I have ever had. I have had this chair for over a year and still love it. You don't sweat in this chair. The mesh is fantastic. Also the bottom mesh is firm yet flexes to your bottom and there is no bottoming out like other chairs. I can sit in this chair all day without fatigue. The head rest is also a big plus. I have been known to doze off for a few minutes for a power nap once in a while and the head rest works great. My dad is 87 and still a pastor. His old office chair is unbelievably bad so I purchased my 2nd chair for his Christmas present.
Pros: 1) good quality 2) nice design 3) good support 4) ability to customize position of many aspects of the chair 5) comfortable 6) easy to put together / instructions were easy to follow. Cons: 1) Not as "cushy" as a plush leather chair might be 2) my chair came with a piece of the plastic covering on the back of the chair broken off (which I didn't notice for a couple days after I put it together and was using it.) Overall: it's a good quality chair - just make sure all the pieces are in good order before taking the time and effort to put the chair together.
I went to purchase a chair to support my back during long hours of sitting in front of a computer. I get ample time and attention to help me select the chair that had the greatest potential to help and a generous return policy in case it didn't. I was surprised to get such personal assistance from a chain like Staples and very favorably impressed.