It's the book that I've always used. It gives a good official overview of everything that is available at WDW. When I first bought it I was amazed at all that there is to do at WDW that IS NOT a theme park. Now there's even more. You could easily spend a week there and still not see/do everything that's available.
We still buy a book every couple of years so that we have more up to date information. But, we've gone so many times that reading BBs gives us most of the new information that we need.
Mary