I picked this up as a part of the Rapture Halloween bundle, and I'm very impressed with it. I read the Player's Guide before starting at the core rules because it's far less of an undertaking, and I must say that it has whet my appetite for the core book.
After reading through this I feel like I could pick up and play the game without issue. All the sections are laid out in a logical order and flow pretty easily into each other. I also liked that it includes a page reference to the core book for almost everything so that one can easily get more in depth with a topic if needed.
The book is a little light on art, but what there is does a pretty good job of evoking the sci-fi/horror genre. As a part of the bundle I'm very happy with my purchase, but I think the book is definitely worth the regular $5.20 price.
[5 of 5 Stars!]