"It's overwhelming," Webber told Reuters. "I must confess when I realized how 'Cats' was going I did say to all my friends, 'You realize that something like this could not happen again,' and then, of course, 'Phantom' happened." (Yahoo! News)
I've been able to see a few musicals over the years (if you get the chance to see "Miss Saigon," don't go), but I'd have to say that overall, "Phantom" was the best. The wife and I saw it in Columbus, Ohio, before we were married. Even though we sat in the 2nd balcony, we were able to see everything on stage. Quite an experience.