I picked it up last Thursday at my local game store, and overall I am very impressed. I tend to run fantasy that is more geared toward horror/investigation, and 90% of these creatures fit the bill perfectly for me! I found the artowork MUCH better than most other publishers out there (including WOtC)- it looked fairly realistic without being too cartoony and/or overly stylized. The game stats look solid too, and although some CRs look a little low, that can be compensated for by the DM. I question the usefulness of the Badass presented for some of the races, but it might be more useful for some.
I especially liked the boggurt, burning man, dream golem, forest slayer, ghost of the hunt, lich hound, lord of the dream, mantrid, noble stag, poppet, q'stal, razor fiend, shadow ooze, redwing, skresh, slaver, slathering mouther, syft, temple sentinel, and undermind. None of the creatures seemed too quirky or of limited use. Overall, I liked this book much better than most monster compilations, and these creatures are IMO more original and interesting than the new monsters (like the grick, spider eater, etc) in the Monster Manual.