This book may not be super heavy on crunch, but it was an absolute delight to read. Seeing old friends from past Adventure Paths and learning what they had done with themselves in the time since, seeing old foes and how the world had changed for them as well. Getting to meet other big-name NPCs of the setting that had not yet properly been fleshed out. This book is my favorite book so far of the 2E line.
I have thoroughly enjoyed this book. I think it's doing a new system of play fantastically, rather than just adding on levels at the end of a campaign. I like that advancement is left to the GM to determine and the overall feel of the book. I look forward to bringing Mythic into the Carrion Crown game I plan to run.