Having finally read the whole book, I can say with certainty that this is a great product. No this is not a book about Abrahamic demons and angels, this is definitely something different, more in the vein of theMatrix/Dark City/Inception and other sci-fi routines. The authors went for something different, and really committed to it. Reading the book gave me plenty of ideas for games and settings, which I always take as a good sign. If you're not afraid of an original take on the concept of Demon, I recommend this product.