I absolutely love this chair. The moveable lumbar section keeps my lower back from hurting and when I want to stretch my back I lean the chair all the way back and I can stay that way for as long as I want. I put my feet up on something and I get comfortable. This chair was the best item I could buy for my office. Being a full-time student I can relax when I want to take a break.
I use this chair for about 4 hours at a time and find it to be the most comfortable I've owned. The lumbar and tilt adjustments allow me to find the most comfortable position.
Good price for all the chair has. The seat is a bit narrow if you have a bigger rear end. But I suppose this helps with ergonomics and prevents slouching. Certainly helps for those 11 hour work days at the desk