Great for the short time I had it
Great product and is great for my tense shoulders and back.  Very powerful like the others have stated.  If it was just on the product and what it does, I would have given a 5.  My complaint is that the controller started to act up after about 3 weeks and I can't change the power level.  Tried to email the company from the manual and its a hotmail address and never got a reply, so pinged Amazon and they took care of it with a refund.
Rating: 3 stars