First of all let me say that this pdf is of outstanding quality. Easy to read and with both photos and illustrations. That being said, it wasn't quite what I expected. Though things such as zombies and alien invasions are covered, the book, for the most part, is an actual quide explaining how to prepare and survive through various types of real world disasters. The pdf contains 100+ pages but the only actual game information is found in the appendices. And even with that not much new material has been added.
Not a bad product, just not what I expected. Thats the reason I'm only giving this a score of 3 stars.