I bought one at Costco. I paid about 175 dollars for it. Used it for about 3 months. 5-10 minutes each evening.
It did not help my pain. It did not make it worse either.
I don't want to discourage anyone.
Just if you decide to sink the money.... I found them on craigs list for much less.
If you google them you can read about the great things they do for some people. It is probably a great stretch. I just did not work for me.
(I sold mine at a yard sale for 15 dollars.)
I hope the person who bought it is enjoying it.