Hmmm, lol, never even tried one? Well, I have, and I like some of their stuff, ap, pf, recreate, all good, prime needed to be dosed stronger, I think usp even came out with a higher(800mg) cap, cissus did/does nothing for me, and Ive seen 1st hand the amazing effects of oep, and jack3d. So to each his own, I never dismiss anything before I learn about it, and often times I try "new" things brought to market, just for the sake of trying something new, the cost is insignificant when compared to the thousands of dollars Ive spent over my lifetime on stuff that didnt work, and Im willing to give USP a chance and probably spend a few bucks based on "MY" experience with the products I have tried that I have liked.