Did the tour in Sept 2004 and had Rae as our guide -the whole thing was AWESOME. Rae was a real treat. It's long though, lots of walking. I'm looking forward to the next trip (?) when our teen will be old enough to take it.
I think I'd be cautious about taking it though if it's your first visit to WDW. The tour was not on our first trip. We were back again in Oct 2005 and noticed that our perspective on things had changed a bit. It didn't ruin the magic, exactly - but we were definitely now looking at things with eyes that had seen "backstage".
Well worth the money.
Shelley