I originally had the cheapest chair on the market and this chair was difficult to get used to. Trust me when I say this I thought I wasted my money and I was disappointed for a few days. After a week I am very comfortable with this chair and I am getting more accustomed to it. The back rest can be adjusted along with a multitude of other things my overall posture is a lot better and this chair is breaking my bad habits. After you get acclimated with the small back rest and the head rest you'll learn to love this chair. I give it 5 stars it was a solid addition to my work space.
i am 5'7" tall. I never had backpain. after using this chair for couple of days I started having backpain and headache. the lumber support is pinching all the time. There is no way to remove lumber support plastic thingi.