Until this book I was excited to purchase all the hardcover rules books Pathfinder had to offer.
The fact that Ninja, Samurai, and (yuck) Gunslinger are introduced in this book make it a non-purchase for me. The fact you put these classes into a book that I would have otherwise purchased makes me ill.
What is next "Space Jockey"? I know... Jedi. Use the force feat Luke.
Perhaps I am being old-fashioned but I consider a "Base Class" should be able to fit in 99% of all settings. These three classes are so exotic that you will NEVER see all three allowed in someone's campaign.
I can just see it now.. Indiana Jones Gunslinger goes up to the Samurai.. Bang.. Dead.. Laugh.
Ninja and Samurai I can see being in an Asian flavored setting book, but to put them as base classes is pushing way too hard. You are giving players the argument "Why can't I play a Samurai.. ITS A BASE CLASS!" and I have to tell them.. "Because this is a fantasy game you idiot not SHOGUN!"
Gunslinger is just spitting in my old-fashioned face. Put this class in the Campaign Book, not as a base class.
I know that I am not alone in my feelings and I suggest you reconsider these classes for this book.. Perhaps it is too late for that to happen.
I guess you rolled a one.