This book really blew me away (to think I was almost hesitant at first!) Every chapter is filled full of great things.
The character backgrounds are sublime, and the lists and lists and new traits (and flaws!!!) is mind-boggling. I also really enjoy the story feats.
The stat blocks for buildings are not only great for a kingdom building campaign, but also for a GM to populate a town with. A lot of the building even have full grid maps!
Honestly, I could just go on and on and on, but I think it would best do the product justice or you to give it a solid read through yourselves.