I've only seen P2000's, USP's, M&P's and a 2011 in the hands of the USBP guys I compete against (and these are many of the "shooters" and instructors from FLETC). I've never seen a CZ in one of their holsters.
A few of the guys in my area are the closest thing to a IPSC Team the USBP has last time I spoke with the guy who's trying to get a official team started.