I actually haven't seen U23D. I remember it played at the Science Center a few years back, but I never got a chance to see it. I had asked a friend to go with me at the time, but I think he was afraid that I might get weirder about U2 than I already was, and that my behavior at the theater might embarrass him. I would be happy to wave my U2-freak flag in the company of fans who understand why certain behaviors are necessary when interacting with U2 on such a scale!
Also, I am not a stalker either, I am just awkward as I get used to the forum.
I feel it is so much easier for me to relate to people in real life, and that the computer makes interactions difficult.