Have you handled the P30 or the HK45(not to be confused with the HK45C)? The grips are fantastic. I own a P30. I’ve run 1500 or so rounds through it in the past year and never had a failure of any sort. All sorts of different brands of ammo as well.
As for concealment, they’re all pretty big but HKS great guns.
I held the HK45C and P30C this weekend (because of concealment, I am inclined toward the compact models rather than the full size). Both had excellent grips, and apparently some interchangeable grip features for customization.
The HK USP 45 ran about $800, and the HK45 was about $1050 ... and I wasn’t sure if the difference was enough to justify the price hike. There were upgrades to the grip (more ergonomic), ambidextrous slide and clip release, longer slide release button, a proprietary seal ring with standardizes the barrel’s placement in the frame, and an alternate bottom which fits standard lights, etc. (the USP model apparently requires proprietary add-ons).
SnakeDoc