I would trust the guys here. I've used their stuff for a while (4years) and compared it to others, and believe me, this stuff is hands down the Best.
In fact, the guy who turned me on to this site has been to a lot of the pro's seminars, (Berardi, King, etc.), is well renowned in his own field and he swears by this stuff.
Total gains in the past 4 years has been 23 lbs, and maintaining bf% at less than 10, and thats not even considered very good.