I bought the kindle version, and I'm glad I only spend the $10, because $34 for the paper version would have been a bit much.
My main complaint about the book is that it really is a detailed explanation of the BubbleBurst game code, from the author, which can be found on Codeplex.
Certainly the MVVM strategy used in the game requires explanation to be fully understood, and I have to say it is very cleverly designed, but then the book should have been called 'BubbleBurst's MVVM design explained', not 'Advanced MVVM'.
I was expecting a book which explains MVVM advanced concepts and uses the game as an example to illustrate those concepts. This is not what this is.
This is mostly an example of MVVM development, explained step by step.
It does include some very good insight, great pointers and some rules of MVVM pattern development, but it falls short of being a solid reference book.