I dislike my .40 USPc...it just doesn't fit me well.
The trigger is too long and curved for me; no matter HOW I hold it, it rubs the bottom of my trigger finger totally raw within 100 rounds. No kidding; the bottom curve of the trigger just really does it to me.
Mags are expensive; normal cap mags are still stupidly priced. It's pretty much a non-issue for the 9mm crowd (they can buy the 10 round .40 mags for $10 each, and get 12-13 rounds of 9mm capacity that way).
Also, for whatever reason, the .40 just isn't comfortable to me as a cartridge. I had the opportunity to run a .45 USPc side-by-side the .40 I have, and the .45 was just much more comfortable, IMO.
I purchased the handgun without doing much testing; I had shot maybe 20-30 rounds through a 9mm USPc, and liked it...not enough to get a real feel for it, though, and not in .40, which feels very different than 9mm and .45.
Just my free information...take it for what it's worth and what you paid for it