The first thing you notice about the book is how well designed it is, plenty of coloured text and pictures to illustrate the point. The design is ideally suited to the novice user, however the content does seem quite advanced, which will likely make the beginners struggle, you would likely need to have a little bit of knowledge regarding themes before you started. I managed to follow a lot of it, but there were some of the more complicated areas where I would still have been having to do online research to confirm I was understanding it correctly.
The list price on the back cover is £24.99, which seems pretty expensive when a lot of the content can be tracked down in one form or another on the internet with out any cost except for the users time and as mentioned, some googling may be required even with the book.
Personally if you are interested in the book, I'd suggest trying to get it from your local library first before you commit to buying it.