My experience so far
This sites pretty legit. They give you a chance to try before you buy, have been around 7+ years and use paypal (picky known for kicking people for any reason) and click2sell a UK affiliate system that rivals Clickbank as their payment processors.
They promise results or a full refund and if its in the first 8 weeks don't even want to know why ( I was told if you used the program that little you haven't had a chance to gain any usable info - otherwise your personal trainer should have worked with you if you asked for help). My first month was a bit of slow on growth, but I am told month one is normally slow, month 2 I grew a little less then an inch and have been maintaining that so far.
I do not know if the gains are permanent yet but they say they are, here is hoping!