Cool... thanks for the input, guys. I went ahead and picked up the Beatles set, and I can certainly say that I'm happy. The Hofner is uncomfortable, but I'm digging it quite a bit, and I still have two GH3 Les Pauls sitting around anyway. The drums... worlds better than the RB1 set. Worth the money right there. Weirdly, I was also really excited about the microphone stand. Finally being able to go into RB2 and do both the guitar and vocals on Tribute was something I've wanted to do for a while. On top of all that, the Beatles game itself is utterly fantastic. While I slightly disagree that the set needs to be $250, I don't regret it a bit.
So, like I said, I appreciate the input, since I never really used the World Tour stuff.
Oh, and Lego Rock Band is kind of awesome. Lego Iggy Pop = win.