I've been reading this book since I saw the mention in the Aliens thread. The layout is pretty good although I wish the artist spend as much effort as the layout guy did.
As for the rules, it needs a bit of cleaning up. Firstly, the game doesn't need a critical hit system, especially one that occurs as often as this one does (19% of the time in opposed rolls). But my biggest beef is the continued use of the clunky Advantage/Disadvantage mechanic; made worse here by the fact that you're now rolling four dice in two pairs.
Also, I don't see the need for both a Sanity and Fear mechanic in the same game.