Well, they sucked live imo, they were not really bad but the sound was awful and I couldn't help just laughing at it...
And in the venue I was in the security only took drinks (I don't know about food) out of the bags as far as I know. They check the bags I think (I didn't have a bag with me) I've seen them going over the outside of the bag feeling if there are any bottles in it, but I don't know if they check on cameras. But if you want to play it really save you sould bring a little camera and put it in a pocket...
Have fun sunday!!