Review (2/5): Didn't really provide expected results
My husband had me order this for his back. His chiropractor uses one, but his is much (MUCH) higher quality than what you can buy on Amazon. This one did not live up to expectations, though. It really didn't do the trick. My husband had me use it on several vertebrae and couldn't tell that it helped, at all. Perhaps it's user error? I don't know. We're just not very happy with the results. It doesn't feel like it's all that adjustable, and it doesn't seem to actually adjust the vertebrae.