i attended both shows in manchester and they were my first, i am from Perth in Australia you see. First night i was on the tip of the left catwalk... i took my camera and got some great photos and vids, BUT, i did not get the emotional high i was hoping for. 2nd night i did not take my camera and was about 4 rows back from the front (in front of bono), it was amazing, the massive screen just overwhelms you, i cried (happy tears) during One and Streets.
So my advice to you is to not take your camera, the memories will live on in your head, plenty of people take cameras and its not hard to find pics on the net. The emotion is what you are there for, and with a camera, the experience is not as good.