I enjoy both Greek Mythology and the Pathfinder RPG; this product is a good combination. I liked all that I read particularly the interpretation of the Pantheon of Olympus. I only disliked what I didn't read...especially the missing Titans of Greek Myth. This is not the first supplement to omit them despite their potential to play such a important role in the campaign.
Considering their differences and personalities, it's unlikely that the Olympian deities would work together at all...unless their was another pantheon of gods that opposed them! The Titans would fill that role without involving yet another mythological pantheon. The Titan deities, who are really just another set of Greek gods, would have monsters and worshippers that would be a major source the world's conflict.
This source book is overall good but could probably use a supplement.
Since other reviews have listed the class features, I won't. I will say this class is easily read and immediately sparks ideas. Instantly, I envision Orc Priestesses opposing elven attackers. I next visualize Kobold Priests ambushing adventurers. Delightful!
The Priest class has been attempted before but I feel Kobold Press has produced something really special. This class feels dynamic and well worth a $ 2.99 price.