I have one. I love it, I bought it for a silly reason, because I love the show "24" and this is Jack's sidearm in seasons 3-8
Now about the gun itself...
It's a fairly heavy pistol so just because it's a "compact" doesn't mean its the best for ccw, but its manageable. So far I am more accurate with my Glock 17 and the Glock is lighter
But I do love HK for their craftsmanship, its a beautiful piece and well put together machine. Lifetime warranty with HK, and the gun has a safety which I prefer for ccw. Just went to the range and shot it and my Glock 17, heres a side by side picture of it
Uploaded with ImageShack.us
My friends preferred shooting the Glock, my brother's fiancee did as well. HOWEVER, the HK is a beautiful and equally awesome gun as the glock but it all depends on what you want the gun for.
HK USP-C are also pricey so just make sure you love HK. Otherwise you should save yourself 300 bucks and get a Glock