I highly recommend this chair. It is so hard to find a chair with the seat dimensions of 20" deep. My legs do not hurt or cramp anymore. Online states that the depth is 17.5" and that is a misprint. Lumbar support is perfect for me as I am 5'6" tall. The seat and back of the chair are both mesh. Sitting in it for 8 hours it was not hot. I like that you can adjust the arm rests.
It was easy to assemble and has been great to use. I highly recommend it. Another person who sat in it to test it out said she wanted to get one for herself.
Chair isn't comfortable. I can't return it because my co-workers got rid of the box when I was out. The back is too stiff and the seat doesn't hold when I raise it up.
Before I bought this chair I tried three other brands that were far more expensive yet ended up being far more uncomfortable. This chair has wonderful back support and while it may not be fancy it's quite functional and surprisingly comfortable. It's also affordable. I can't predict how long it will last but thus far it seems well-made and it is really good on my back. Glad I bought it!
Chair seems good. Setup instructions could have been a bit more precise. Arm rests are a bit wobbly but after using them a few days it seems to be a good thing.