Got it. Love it. Can't wait for the look on my players' faces when they're face to face with some new and exciting NPCs.
The beauty of the book, I think? None of the new builds obsolete the core classes. Balance is paramount. Players are not at a disadvantage if they do not spend the money on this book, nor do they get a serious advantage for the purchase. Instead, they are rewarded with options to create nearly any kind of character they can imagine.
Great work, Paizo.