This ball is very high quality. The walls of the ball feel a lot thicker than other stability balls I've seen. I use mine as an alternative to a desk chair at work. I'm 5'3" and it seems to be the proper height for me.
Be sure to purchase a good air pump. This ball didn't come with an air pump, but usually the pumps that come with these types of balls aren't very good anyway.
I had a small slice in the first ball they sent me, that looked like it could have been with a box cutter in their warehouse. There was no air leaking but I was still concerned. I sent the company an email and I was responded to very quickly. The representative told me to throw out the damaged ball and she was sending me a new one that day. Perfect hassle free customer service experience. I couldn't have asked for anything more. Great company. Great ball.