My VP9 is literally Kraut Space Magic compared to my USPs. It really is retarded what everyone but Glock has to do to get around Glock's patents of their very simple design. They pretty much figured out the most efficient way to do it right off the bat. What they really got right with the design is the near toolless maintenance, where you can detail strip the entire pistol down with nothing but a punch. This design feature oddly enough is something it has in common with the 1911, as with a mil-spec 1911 all you need to take one completely apart is an empty shell casing for the grip screws. Granted the USP isn't exactly difficult as you will need a hammer to punch a few pins out, but the VP9 has a fucking blind pin in the slide, I have no idea how one would go about pulling it outside of threading a tiny easyout or screw into the roll pin, and then pulling it out (obviously replacing it with a new one).
The LEM system for the USP is far less complicated than what HK had to do with the VP9, imho.
The Walther P99 I played with actually felt better in the "double action" mode than a regular Glock trigger, just with a little bit longer pull. The reset and "single action" were miles better of course, but I would have to actually shoot one to really judge if I like it.