I am not familar with the Fleet Center, but I can say from experience at Pheonix during Elevation that it is definately still cool. You get to be the first to see them come in, you can practically read the setlist on Larry's kit, they give you video monitors, and Bono remembers that people who plunked down their "hard earned" are seated behind him too. Behind the stage isn't preferable, but it not bad in the least. U2 takes care of everyone in the building.