I just got one through Davidson's. (seems like it was $874) I wanted to like the Sig "Blackwater" but it felt wrong in my hand. Too heavy, to blocky in the grip. I tried the H/K and it fit like a glove. I haven't changed the grip parts at all. The reach to the trigger was just right. Mechanically, it's like a Swiss watch. Everything is smooth and tight. I fired about a hundred rounds through it without a single hang up. (it's new).
It's so new nobody has a holster for it, although it may fit with the H/K USP.
You can only buy magazines through H/K but it came with two.
So far it feels like the best pistol I own. I got it in 9mm. so the ammo is cheaper. Nice addition to the collection. I don't think anyone faults the H/K quality.