I want to learn piano myself and so does my 8 year old so I bought a few books, but this has been the best by a long shot, even for my old age group. I did music in school, never piano though, and after two weeks I'm playing the likes of Strangers in the Night and Annie's Song - very slowly though, so I'm no genius.
Anyway, the book is engaging, facts are so well presented and absorbed easily, I don't know whether its the pictures of the little monsters or what, but it works. I have a full understanding of the notes, chords, how to read the music and how to use piano fingering. I do about an hour messing around each night and am improving daily. I initially read the book in bed and felt I had some knowledge but when I sat at the piano, it all just happened. I've read the book a few times now because it's short and sweet, my daughter loves it as well.
Basically if you buy this book you will get your value for money, you'll refer to for years and you could nearly teach your dog to play! Enjoy!!