I saw them live in concert, at the University of South Carolina, in Columbia. I thought the Beach Boys concert was amazing, but Def Lepard was an equal. I personally feel that Def Leopard is the greatest band ever.
I've got several Guns n Roses cd's. If they were more politically correct and didn't use such foul language in the non-played songs, they would blow every one away, including the Rolling Stones, or the Beatles.
If you haven't already? do a search for Gun's N Roses on youtube, and listen to the songs that weren't played on the radio.