Annie -
I just bought that yesterday. It didn't work that great yesterday, but the instructions said it can take up to 10 uses for you to get perfect results ("skin and hair apparently need time to adjust" - which sounds totally fishy to me).
Anyway, it's not for use on your face or bikini area. Unfortunately I didn't believe them. Let's just say unpleasantness followed...
On the plus side though, my skin is softer and smoother, and it doesn't hurt at all to use on leg or arm skin. It was a bit warm though. Kind of felt like a massage actually.