I love this chair!  The only thing I would change is the ability to adjust the seat height and knee height SEPARATELY.  For those of us who are more petite, and do not have a height-adjustable desk, it's difficult to get the right height for both... if the knee pad is high enough, it makes the seat too high for a standard desk.  :-(  But other than that, I really like the chair and back support which I didn't have on my previous kneeling chair/stool