I want to say first that I like True20 as a system quite a bit. That being said, this is not a really useful product. It provides an overview (with some crunchy bits) of a handful of game settings most of which have now come out with their own setting books (Blood Throne & Nevermore are two that come to mind). There just not enough here to do much more than raise your curiousity. This just seems like a collection of previews for other books.
[2 of 5 Stars!]