I thought this book was excellent. I enjoyed the narrative-focused structure of the game, especially the idea of One Unique Thing and backgrounds. The classes are also extremely unique and the world presented in the book in engaging. I have also purchased the 13th Age Bestiary and 13 True Ways and have been consistently impressed in the quality across all three books. There are tons of good ideas and the system seems tightly focused - the rules have purpose and focus on creating a good time at the table.
[5 of 5 Stars!]