I love UG, and I have to say that the touring plans really do work. We had excellent experiences with those on our last trip, especially in MK. I bought a new version for our upcoming July trip. Birnbaum's is completely biased as a Disney mouthpiece; UG gives the positives and negatives about everything, and it includes reader feedback, too.
I don't think there is enough new info to buy a new book after only 2 years. You can get updated info on their website. I have a 2002 and 2006 and even though there is a lot of new info, most of the book is exactly the same. You might want to try passporter or TGM.

