I've been sitting in this chair ~8 hours a day for the past week and so far it's held up nicely. I was getting a lot of soreness in my neck/shoulders with my last chair but that has completely disappeared. Comes with a 7 year warranty so this is a no brainer.
This chair is comfortable and it has several ways to be adjusted. The only thing I would ask for is for an armrest slide. Also the headrest is too low.