The majority of this book is reprinted rules from other books. It is bulked out with some limited new rules and background on the major factions of Golarion.
This book would be good for people who own only a few of the other source books and want some Golarion Themed archetypes & prestige classes to try. It draws together rules spread through other books including Adventure Paths.
One of the nice things is that it adds archetypes for some of the newer classes (Occult/Hybrid) to fit in with the factions.
If you are already a subscriber to Player Companion etc you will get limited benefit, I felt frustrated as I turned page after page to see things I already had from other products.
It's especially annoying that this was part of the subscription, as subscribers are the customers who are likely to need this the least! I feel a bit ripped off about that.