This is an amazing book overall. There are a few minor typos sprinkled throughout, which is something you'd expect to have been resolved in a product this high profile. I did get the print on demand and I'm very happy with it. It's extremely high quality and each NPC and monster has full-page art associated with it and the art is all great to amazing in quality. The book at it's heart is an DM's aid for creating a campaign that can run from level 1 all the way to the higher levels. Secondarily it's also a great source for for filling in those content gaps that hit 5e after level 13 and giving higher level players something meaningful to do.
And it re-introduces some classic monsters to 5e, such as demodands, phaerimm, and Pazuzu.
[5 of 5 Stars!]