I DMed a small group through The Mysterious Tower late last year. One of the players kindly wrote a narrative about the adventure which I compiled and added to and then posted up on the Enworld Story Hour Forum
here (skip the first post if you want to go straight to the story).
I made some minor and not-so-minor changes to the adventure. Overall the players had a great time and I had a lot of fun DMing it. There was one puzzle that caused one player (the author of the narrative, actually) some angst, though.
Anyway, I'd recommend having a read of the Story Hour (I think it's a very enjoyable read, myself) -- I'm more than happy to answer any specific questions you have.