I just picked up one of CDNN's USP .40 police trade-ins a couple weeks ago. While my pistol shows a little more holster wear than yours, I still feel like I got a great deal for ~$475. I've never been much of a .40 s&w fan, but the HK really tames the "Snap", its honestly a joy to shoot. In fact, I liked shooting it so much, I just picked up another .40 (a Sig sp2022 from CDNN as well), hopefully the Sig will live up to the standard my USP has set.
Congrats on your purchase, I think you'll really like it.