Overall this is a very good office chair. My only disappointment is the head rest height is not adjustable and it's too short for me to use. I am 6'0" and when sitting up straight my shoulders hit the head rest.
Chair was very comfortable once assembled. Assembly instructions could have been better but was pretty straight forward despite that shortcoming. Unfortunately after only 2 short sessions of use the mesh tore loose from the supporting frame on the seat (lower) part of chair. There was no abuse my wife is 5'3" and weighs about 135 lbs; so no undue stress occurred. Total time of use was less than 4 hours when this occurred. Our local Staples service to return the chair was excellent. However loss of the time it took to haul home assemble return chair is a big disappointment. We liked the ergonomics best of this chair vs all others we tried. However due to our experience on durability of the mesh fastening system we cannot recommend this product and would suggest exercising caution on any chair with mesh construction.
This is a comfortable basic chair. The adjustments to height and tilt work well. My main complaint was that the height of the head rest isn't adjustable (only its angle). I ended up just taking it off because it was pushing my neck forward. Lumbar support is also ok but I will probably end up getting an extra support cushion so I can sit further forward.