I've only seen them live once and it was not a particularly good concert -- Bono's voice was off, and we paid a gazillion dollars for not very good seats. If I could get better seats next time, I'd go again, but if I got stuck in the nosebleed section, I'd probably pass since I live 90 minutes from where they would perform. That means a three-hour round trip, which is really tough on a school night.
HTDAAB was the first U2 album I ever bought when it was fresh, and it prompted me to work my way back to learn about the band. But it seems like forever since that album came out and as others have said here, there is so much fresh music out there....I hope U2 won't lose their new fans like me by taking so long with this one.