I listened to the audiobook version, which I guess takes some of the fun out of the "Choose your own adventure" experience, but on the other hand the audiobook is narrated by NPH which is awesome. The book is fun and witty but also very emotional, inspiring and full of magic. 
 I would have liked that all of the actual celebrities narrated the parts where they talk about NPH, like Penn Jillet did, instead of the other narrator who although has a great voice, was in my opinion not the right voice for this kind of book.