exceptional. I was visiting with a college administrator friend , who had one of these. Being in the medical profession and doing hours of research and documentation, I was left with a stiff neck and sore back. I immediately went to your site, bought this product and it has changed my life. My back is in better shape, I can do circulation exercises, and get muscles moving again. What a great product!! Now trying to figure out a way to pack it with me on business trips!!