Which models have you used?
I got a chuckle reading about their "horn loaded" IEM antenna.
Update: I used a CP model for my surveillance antenna on the MLS Cup final at BMO Field last night, and it was great. With it, running down 100' of not-so-low-loss cable, I was able to:
-See and listen to an un-coordinated frequency which turned out to be a Sennheiser EW-100 hand held mic at the DJ booth at the "Bud Big Rig", parked outside the venue. This was at least 500' away.
-Determine that the two Senn SK2000 lav packs that were being used for coach mics were not set to the same power output (one was on Normal, the other on High). These were in one of the booths, about 100' away from the antenna, and 90* off axis.
That's just a couple of examples.
So, I have already made a cut-out for one of these in my road case and will be using it on all future gigs.
Full disclosure: I am authorized to sell this product in Canada. That said, I'm not about to get behind anything I don't believe in when I'm putting my reputation on the line!