Rating: 

The examples were effective and relevant, although at times it felt that some previous flex knowlege would have helped to bind them together (the source code on the web site helped on at least one occasion).

There was a significant amount of "what's changed" to keep the pre 2.0 flex developer interested, although I did find reading about previous version features to a bit distracting at times.

The informal writing style was easy to read and engaging (except that I have obviously missed a major learning experience by never having heard of Bubble Bobble).

Overall, a book that gives a lot in a small package.