This document is the best I've seen on the Dreamlands. It keeps the Dreamlands mysterious and fantastic while at the same time underscoring the horrific and terrible nature of the realm. Too many depictions I've read either play up the place like a pure fantasy land, akin to Melibone or Hyperborea, in order to interject some lightheartedness into the mythos, or focus solely on the horrific aspects of things like the gugs or moonbeasts. Instead the authors develop both aspects equally, never letting the wonder and horror overpower the other overall. Individual moments within the campaign will emphasize one or the other, but the aggregate demonstrates the horror in beauty and the wonder of terror.
As a game supplement, the book is written well. The text is clear and easy to understand while remaining evocative and inspiring. The layout of the text is conducive to easy and quick reading and the artwork adds wonderfully to the atmosphere. So far, I think my favorite is an image of Nyarlathotep as the black pharaoh.
While this is written and published by the same guys responsible for the wonderful Delta Green books, this campaign fits well into any Call of Cthulhu campaign, with or without Delta Green, and the material inside is usable as source and reference material for any campaign which will involve the Dreamlands in any capacity.
A must buy for fans of Lovecraft's Mythos.
[5 of 5 Stars!]