Ugh, I can't remember the name of it! It's an infomercial with a blond woman, and she's on some kind of air thing that works like a stair stepper...sound familiar? I keep meaning to look up reviews on it, but I can't do that without a name, lol.
I think I read bad reviews on that one also. Have you tried a mini trampoline?
I was using mine yesterday and thought it probably works about the same as those mini-steppers. I really enjoy it.