I must say that I was very impressed at the ease of "Break-in" for the chair. One thing I especially like is the adjustable back adjustment. This chair can lock when leaning back: So many expensive chairs allow you lean back but then go back to the "up" position. Nice feature!
I was having back spasms with a previous chair that has a seat made of foam over cardboard. This chair is very comfortable and I am not having the problems I had before.