I and my group have been cackling with glee all day as we went through the book and we are happy to say that it exceeded our expectations in every way.
As a GM: Tons of lore, fun tools and VERY good options for NPCs. The Infernal contracts is going to be hysterical if we ever play in an evil campaign.
As a Player: Tons and tons of crunch, both very flavourful and powerful options for those willing to sign their soul away. Never thought I'd see the day when there's a legal way for a player to become a Worm that Walks!
And the Souldrinker, one of my favourite PRC's ever, had its most powerful ability removed and still it ends up not only feeling stronger but also more fair. That's how you reprint a Prestige Class.
The criticism I have is that it might be a tad light on the feat and that we would have liked some more spells and maybe discoveries. Still I think this is one of the most fun packed books you've put out in ages.
