I have used a similar product with chiropractor and wanted to have one at home. Saw this and took a chance and boy am I glad I did. I use it on my arthritis in my ankle, and it relieves pain and tight feeling. I have also used it on my dogs back and see a marked difference in his tight posture. I feel it is a great product for the price. I have since bought one to give to a friend who has chronic pain.