USP labs has pretty good products overall. I currently use PSlin and Anabolic Pump and have used PowerFULL. I think PSlin is great based on my experiences.
You have to be careful with their ads though. The guy who runs USPLabs is a gigantic douchebag salesman who will tell you the most ridiculous shit to get you to buy his product. For instance, saying that PRIME is so much better than AAS it renders it obsolete. Hahahahaha. That ad should be illegal.
I have not used PRIME, but I cannot imagine it being anything that amazing because everything USPLabs makes is herbal stuff from India. It probably is decent but definitely not worth the sum of money is costs.