I was taping Rush recently. I got in fine, but was getting my gear ready in my seat and a lady usher asked me if what I had in my hand was a recording device. I calmly looked up to her and told her it was a walkman. She was cool with that and walked off. So, in certain instances you can play into the not so bright ushers/security.
Another time I was getting into the venue, using my fanny pack as usual with the back compartment. This time, the guard decides to feel the back of the back. So, he finds I have a DAT deck there. Tells me I can't bring it inside and have to take it back to my car. He had no problem letting me back in, after a pat down (had the pack not been seen before, no issues).
I even got caught taping Widespread Panic, heh. Until now, I only did stealth taping and figured I'd just sit 20' back from the stage. I wasn't blocking anyone's view but the staff didn't like that I was taping in the non-taper section. So they made me join the rest. At least it was during the set break and not during their set.
I guess if you are cool with the staff, they are cool with you. I've taped quite a few with only a few times being caught. I figure it's to happen eventually and to just chalk it up and do your best to stay in the show without checking your gear in.
Tape on,
Jeff