yes, I'd like to know about lower back and painfulness too--that's where I want mine.
How much do they cost? I truly have no idea.
And Valkyrie-- has even more meaning as my last name translated into English means the sea.
I always thought if I got one it would have to incorporate the sea in some symbolic way because of my name and because I LOVE WATER and being in it, am a total fish that way-- i surf, fish, swim, anything to be in or on the water.