I've used them, I think they are excellent quality. I havent' used them extensively though and couldn't say if they worked better than other stuff. I think the diet works, but as w/ any diet, not necessarily works well for everyone.
I like to try lots of different things and add my experiences to my package of goodies. I LOVE the shakes and I believe the quality of all the supps is excellent, but it tends to be more expensive than other stuff.