This chair is very comfortable! I work from home and definitely needed to upgrade my old chair. I’m so glad I got this. Yesterday was the first day using it. I worked 10 1/2 hours and my back felt great the entire time. It adjusts in all the good ways, the seat goes up and down, the armrests can be down or lifted up (so it can roll under tighter fitting desks), and the tilt angle of the backrest can be adjusted. The rollers are very smooth rolling. It is very comfortable to sit in and provides great lumbar support, hitting in just the right spot. I'm very happy with this office chair!