There is a woman i work with who moved her office chair over and uses one of the Swiss balls as her office chair. At first I thought it was really odd, but when I have to work at her computer(IT guy) I really like it. It forces you to sit with good posture, and it is much more pleasant than I expected. I just don't know if I could get away with my own, and keep my man card... Hers is from golds gym and it has some sort of sand like substance in the bottom to keep it fairly stable. I've thought about getting one at home.