We purchased our ThermoSpa because I have severe degenerative joint disease. I knew that it would probably help me but, I had no idea how much. When I am in my hot tub it is as close to feeling like a normal human as I can possibly get. Although I am not pain free in the hot tub, it does help/ What I find the most interesting is that when I am in my hot tub I am not stressed by my pain. The hot tub is very very helpful in making each day better for me, in spite of my joint disease. It was undoubtedly the best purchase we have ever made!!!