Last year we bought U2 tickets for our anniversary. We debated a long time whether it was worth it, but finally did and and within 2 days, Bono announced he needed back surgery and the concert was delayed a year. Slightly disappointing, especially as we were hoping to have a new baby the next spring. Luckily it worked out though, thanks to Linny coming up with her newborn and watching MK, though she wasn't too thrilled about a bottle.
The stage was pretty cool and they had amazing effects.
Since I haven't really been to a concert since NKOTB in 7th grade (remember that Julie and Shelly?), I was pretty easily impressed, though Bono was a little goofy to me, but I guess you kind of have to be.