My SigPro 2340 in .357SIG was 100% reliable, a very good shooter and much less expensive than a USP. HK makes fine pistols, but I seriously doubt that a USP is worth 20-50% more than a SigPro. If it wasn't for the fact that I've sworn off "magazine crippled" large pistols, I'd buy another SigPro in a heartbeat. They are really undervalued and not properly appreciated. Also, I think they're among the best-looking polymer-framed pistols out there, along with the Walther P99.
My main beef with USPs has always been the price, the too-sharp grip checkering, and the looks, especially the ungainly and clunky-looking USP Compact. I also think that the USP Compact grip is just way too fat for eight rounds of .45ACP.