Never heard of them. But my instinct tells me it's water weight, and that no they really don't work. I always say (and it's not original), if it sounds to good to be true, it probably is.
My thought on that kinda stuff is it might be useful for an event where you want to look a little smaller. I'm sure it all comes back within a couple days.
I'm with you Unwanted37, my friend just had it done this Sunday and said she lost 2.25" from her tummy area. Now I'm very tempted, but it does sound too good to be true and fear I'll just be wasting my money. Anybody here have any more information?