Three reasons to get this: 1) excellent potential additionas and changes; 2) identifies areas where the GM might want to add or change something themselves; 3) ideas on how to incorporate additional Paizo content written about the area where the adventure takes place.

There is no way that I'm going to use all the content in this product, but I have used some of it and I will be using other parts. It's very helpful and creative and encourages GM creativity. The additional background info on adventure NPCs is something that is easy to rely on and productive in game.