It was a gift. My sister Loves it. Says it is really comfortable. supports her lower back and her head and neck. I told my husband that I want one for my birthday.
My husband's back is messed up (he is having his second back surgery next week) and he thought that sitting on a ball chair was a good idea. After 2 weeks of being in more agony than normal I bought this chair. He is SO MUCH MORE COMFORTABLE now and the ball chair is sitting in the corner. The mesh fabric also keeps you cooler than a ball chair or a typical office chair that has no air circulation. Here in Arizona even though we sit in the A/C all day during the summer the office chair can get a bit warm. Buy this chair - you can't go wrong.
its very painful to assemble but it does have lots of adjustment it took a while to find the best position however the mesh is kinda hard and hurt my skin