I've tried it before!! Great stuff!! I can't say I lost 7-10 lbs, much less the first week, but that's me. I did loose some fat, and get somewhat leaner. When I went back to get more, my supp guy didn't have any more, and it was the holidays, and he couldn't order more until after the 1st of January.
I'm off ephedra type products right now, for two more weeks, so it doesn't matter.
Cellucor, I believe, is the company that makes this stuff.