The (LEM) Law Enforcement Modification trigger system variant is now available on all modlels of the USPs. This provides a positive 7.5 to 8.5 pound pull. The short trigger reset ensures that follow-up shots are rapid and on target.
I don't know about other HKs but mine is really good. It might that I am less picky then others and except a military type trigger but to me it's smooth in single action and what I would expect in D/A.