The book contains everything you need to play, from rules for Magic & Mad Science to charts full of random doom and mayhem. I like RPGs that I can play without buying half a library first. The book is fun to read, especially the chapter concerning NPC is full of inspiring or simply hilarious ideas.
The rule system is a mixture of Cortex and Fate. It is easy to learn and fast to play. The Fate elements like aspects and stunts make it easy to emphasize creative and unconventional game play. A very good choice for a setting like Demon Hunters. My personel highlight are the Demon Dice. The players can use this pool of dice to increase their chances of success, but every die has to be handed over to the GM who can use them to increase the thread level of his evil doers. This is a great way to raise the stakes in a game session.
Conclusion: $ 15.00 for hours of fun. Deal!