You get a philosophy of touring that is different from those other resources. You get lots of info you might gather from other resources, all in one place. You learn things about doing WDW you can't find anywhere else, although there are those who will disagree with me on that.
And you get a full refund if you don't like it. I personally think it is the best resource I have found, although I also like Passporter for the format, and UG for the humor. JMHO YMMV