This isn't a book that you can sit down and read; it must be part of your experience. So if I was rating this book on readability alone, I would rate it probably 2-3 stars.
I haven't been to Disney World or Epcot since my honeymoon in 1996 and I probably won't ever go back, but if I do, I'm definitely taking this book.
Until recently I didn't know what Hidden Mickeys were, but this book talks in detail about where to find them and includes a bunch of scavenger hunts and lots of hints, complete with a scoring system.
Just sitting down to read this book was boring, since obviously I couldn't participate in any of the searches, so I merely scanned it. However, it's an excellent book to bring on a trip to Disney World/Epcot if you want something fun and different to do, especially if, like myself, you've been to The Magic Kingdom or the other parks more than once. BTW there's a thinner, almost identical book for Disneyland as well.