I'm not done with the book, but I have to say that I'm seriously impressed thus far. The character generation alternatives are really original! And the last section I read was about the Infected, which was a fantastic in-universe piece. I especially liked Red's section, but I've always had a soft spot for Hannibelle. Plus, I love her name.
So far, this is one of the best-constructed books I've seen. I'm using a PDF, so when I refer to construction I'm referring to layout, organization, etc. The sections flow really nicely, and the references to other books are reasonable and I haven't seen any contradictions yet at all. Really great job, everyone!