I bought this chair as a gift for my husband. He put the chair together but he hasn't used it since he constructed it 4 months ago. I am thinking about taking it apart and selling it again. The reviews for the chair seemed like a great ergonomic solution to back problems and too much sitting in the office. However, at 6'2" the chair just doesn't work for him. The ball also seems extremely small, even for me at 5'4". Reviews that I read said that with wear the ball would stretch out and would allow more air to inflate the ball and increase it's size... but we haven't even gotten that far since no one wants to sit on it. Looks cool in the picture, but looks cheap in real life.