I am a new USPLabs user.... and thus far I have only (and am currently using) POWERFULL. So needless to say, it's my favorite. I plan on using the others very, very soon.
POWERFULL is on my very short list of supps I recommend to others, and my clients. I began using it during a break from working out, (around 10 days), and when I resumed working out, I hadn't lost a thing. The POWERFULL was the only supp that was different in my regimen, and the only other supps I was using were protein, liver tablets, and Beverly Muscle Synergy pre-workout.
USP, you keep up the good work, and you can rest assured you have a regular user right here!