My little girl will get a lot of use out of this book. We have only had it a few days but she loves it. She is only 18 months, so as she gets older the more she will get out of this toy. It has a lot of options, and helps little ones learn words, colours and counting.
It probably is better suited for children that know the tv series as it refers to all the characters in the interactive games by name, so it might be hard to do the games without having watched the show. My little girl is a big fan of the show though and can't get enough of this book.
My only criticism is that there aren't really any songs - there is a music option but it only plays very short music clips, rather than songs to sing and dance to. But for educational value I cannot fault it.