I like mine a lot. Very accurate compared to my G23, about on a par with my Kimber 1911. I keep the UTL II on it on the nightstand. I keep the thing cocked'n'locked at all times because the DA pull does suck. I would only use the DA if I was down to my last round and it needed a second primer strike.
No reliability problems at all, of course. I like how the mags insert cleanly, compared with my G23 which have to be slammed in to get them to catch when the slide is closed. I had no problems adjusting to using the trigger finger to release the mags.
My only problem with the USP has been getting a taller front night sight for it. The thing has been shooting about 5-6" high @25y. I ordered a taller front night sight for it. After a month the outfit I ordered from sent me a a standard front sight @ the height I ordered. I can't believe how hard it is to get parts for an HK. The hassle is unbelievable. I decided just to send off the front sight to Trijicon and have them put annsert in. $26 for the sight plus $85 to install the one tube.
While waiting for the new front sight I picked up a set of adjustable Mepros for $60 and got the thing shooting POA. I'd leave those on but the front sight is so high it won't fit in the Blade-Tech belt holster. It will fit in the Blade-Tech holster I have for the pistol +UTL, but that's not really appropriate for IDPA, etc.
At the price I paid for the USP at least they could offer some KY Jelly. Instead I get a fistful of sand.
Somebody add up what I paid to drop the POI 6" -- but don't tell me, I'm in denial.
All that said, I do still like the pistol. I'm picking up my P7M13 on Saturday. I'll use the USP when the P7 gets too hot.