OK, it's well-written and presented, but, unless you're a WDW novice, I'd save your money. On the plus side, it contains information which would undoubtedly take a long time to assimilate yourself, and it is all neatly packaged in one place. Because it's an ebook, it's available immediately you make your payment - no waiting for the postman. It's up-to-date with all the latest information and there is unlimited access to future updates.
For the planning-obsessed, though, there's nothing new here at all. And despite the advertising blurb suggesting sharing it with friends, relatives and neighbours, it does contain the usual copyright notices.