I've read this cover to cover twice, and ran a few games with it. I'm glad I was an early backer and even more glad that I backed the other chaos worlds Magpie games is writing. It's really, really well written, and gives GMs tons of tools to play with.
-The writing itself is really fun to read, I didn't have any issue getting through it.
-Lots of adventure fronts to play with
-Plenty of fun treasure items that can be introduced into nearly any setting, but all have awesome backstory within this one
-Well fleshed out villains!
-The compendium classes are really great
-The advice for LongCons seems like it could come in handy. It's a novel idea and I'd love to attend one.
There's one map in the book, and it's a bit lacking. Off the top of my head, it's missing a scale guide, and on each of the PDF readers I tried (One on my tablet, Foxit Reader for desktop, and the default PDF reader for windows 8), a few places lose their labeling (Anglekite comes to mind). I'd also appreciate city maps, or at least a map of Pandemonium for visual help in the "Pandemonium politics" track. As it stands, I used some randomly generated maps and then threw in the particulars that were necessary for the setting.
Overall, I LOVE this playbook, I love this setting, and I can't wait to play more within the Crater Basin. Now I just need more friends who want to play more often.