Have had the USP45, USP45 compact, and tried the MK23 MOD O.
Tried the new HK45 and HK45C LEM (DAO) versions last year at the SPOTC at Kirtland AFB in NM. Liked 'em, preferred the HK45C (compact). Look and feel much better than previous HK45s. Think of the HK45 as a 45 version of the P30, and the HK45C as the 45 version of the P2000.
Patiently waited, traded away some Glocks and 1911s for two (2) new HK45Cs V1 (DA/SA w safety/decocker thumb lever).
About 7x5 inches w 3.9 inch bbl, 8/10 shots (w extended sleeve mag; uses same 8 round mags as the USP45c, same 10 round mags as the HK45. Fits in Blackhawk CQC for HK P30.