I've been debating about buying this for a couple of months, but it's kind of pricey. Leslie Sansone sells a belt with resistance bands that kind of does the same thing and is cheaper. But I like the look of the Powerbelt. Can't tell you if it's any good or not, as I don't have it either!
One thing is that if you want any other resistance levels than the ones the belt comes with, that's even more money added on to the price, which could skyrocket quite a bit with shipping and handling. Unless this is an awfully good, supercomfortable product that you'd use again and again, I'd think long and hard about that price ...