Love, love love.  We bought this little gem to help me with pain management from an autoimmune disease and it really helps.  My husband didn't even want to buy one and thought he'd never use it.  Well, he is finding great relief from his shoulder pain, he's in construction, and uses it quite a bit too.  It has increased our electric bill a bit but not terribly, as we do live in Minnesota where it gets mighty cold in the winters.   The trade off is definitely worth it.