I have experience (misplaced or forgotten cables
) with CA-14 cards straight into the R-09HR at rock concerts from
balconies (I'm rarely on the floor)* and sound quality was just as good as with a BB if a tiny bit noisier. I can't comment about how they'll do on the floor, or particularly close to the stacks, however, so keep that in mind. The next issue you'll have is battery time. Using PIP drains the batteries very quickly, and if you aren't careful you might end up juggling batteries, or perhaps be SOL if you only bring one pair.
*Actually, I did have to do this at a somewhat loud show at Lincoln Hall earlier this year. It's a small venue, and even being on the floor right by the board (as far back as you can be) is only 40' or so. The stacks weren't blasting quite as loud as in an arena, mind you, but they still handled everything fine. The distortion I ended up with was caused by not being able to check the levels for various reasons and having to guess about where would be good. I didn't do so bad, though!