I've tried just about every chair you can imagine and NOTHING beats this darn thing. It's as comfortable as I have ever had. It's not just another balance ball thing -those suck. Seriously you need to try one. I've been in chairs that are 600-1000 bucks -you can get this for 70
- No ventilation -It gets hot, so I have to rotate the ball from time to time
- It amplifies the sounds of a fart like you would not believe.