your standing there getting your setting correct and dialing in to get the shot and BLAM!!! out the corner of your eye you see them like the film "Sixth Sense" and you hear a whisper like the voice from "field of dreams" saying in the wind "I see Ipads taking picture"...
Now i dont know how well the low light capabilities of the ipad works but why not go to your next gig with your pocket size camera.