I've needed a new office chair for a while. Last year I purchased one after sitting on it in the store for over an hour. I spent a few hours assembling it and when I sat in it I got shooting pains down my legs. I tried for a couple of days but finally disassembled it (a few more hours) and returned it.
Before this purchase, I spent a lot of time at Office Star's site reading the detailed specs as well as all the reviews on this chair here and elsewhere. I was still a little leery of buying a chair I had never sat in. I needn't have worried.
Assembly was a breeze. Push in the 5 casters (push hard), screw in 11 screws (4 with washers), drop in the pneumatic tube, put the chair on the tube and you're done. The seat and the back are not at all flimsy. That means they're fairly heavy, but the chair is so well balanced that I had no trouble attaching the back by myself. (You have to supply your own Phillips head screwdriver.)
The chair is quite comfortable and the back support is forcing me to sit properly for the first time in ages. The mesh feels quite strong and I'm not worried about it sagging any time soon despite the fact that I'm a large woman. The seat is thick leather but it is flexible. The leather is on the top and front only -- the sides and back are mesh which I assume allows it to compress and expand better and it looks fine.
My favorite feature is the adjustable arms. Between the office and home, I spend a lot of time on the computer and I always have knots in my neck muscles. Once I realized that the fixed arms on both chairs I used were too high, adjustable arms became a requirement for me. I've set the arms a fraction of an inch below what I'm used to, forcing me to drop my shoulders to make contact. After only 5 days I can already see and feel the difference.
If I could change anything, the seat would be about 2 inches deeper, but I knew that before I bought it. I didn't see another chair of similar quality with the features I wanted (leather seat, mesh back and adjustable arms) plus a deeper seat unless I wanted to spend at least double what I did. I consider it a good trade-off. And the chair is fairly big but, because the mesh back, it visually takes up less room that my old chair. That's important because I live in a small apartment and my computer is in my living room.