Best thing I ever bought on Amazon
The only reason I didn't give this five stars is, I would have liked it to be flexible instead of rigid. This is because my problem is on one hip joint only.  But by maneuvering the unit and a couple of pillows, it hit just the right spot and was wonderful. Your choice of speed and heat, auto-shut off after half an hour. Excellent value for the money.
Rating: 4 stars