I bought this because I had bought a couple of excellent smashing guides and assumed it would be the same. It wasn't.
The book summarises and links to (or mentions) the guides and information that you wish it contained. It's like buying a set of bookmarks rather than the guide I wanted it to be. If I had wanted to do the legwork and run around I wouldn't have bought a book, I would have done it for free.
There is useful information in the book, but not as much as I had hoped, and the way it approaches information annoys me.