I am so impressed with the effectiveness of this product. It really works- my whole family uses it to relieve various aches and pains, and it helps tremendously. I'm also very impressed with this company's Customer Service. They responded immediately after I emailed them about an issue with my battery, and sent me a replacement right away. Even followed up with me afterwards to make sure I was satisfied. Very prompt and courteous. Overall- a pleasant experience, and I'm very happy with my purchase! Highly recommend!