We got this for DH for Father's Day, and it really hits the hot spots in the back from below the waist to just below your upper back. It's very relaxing, you can sit on it comforably on our couch or the computer chair. Our only gripe is that it doesn't get us between the shoulder blades--we have trouble spots there. I looked, and the only massagers right now that do that are prohibitively expensive. But our mid and lower backs are quite happy. We don't know how "sturdy" it is, i.e., how long 'til we break it, we'll see.
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May The Hair On Your Toes Never Fall Out

--Traditional Hobbit Blessing