This chair is as hard as a rock. My tailbone was in pain for the whole week I used this chair. I ever purchased a cushion and the pain was still there. Returned.
The floor model I tried felt different from the chair I actually got. There were a couple of issues with putting it together: one hole that you screw into was stripped but it was one of three so we figured it would be ok. I noticed when I sat in it that one arm is a bit shorter than the other measured it and was shorter. After about an hour my back and shoulders start hurting a bit. Trying to decide about taking it apart and returning it...