I'm writing a review of this after looking through it quickly once. However, I know that if I don't write one, I never will.
As with all of the other ROAN materials which I've seen, the artwork in this is fantastic and richly detailed. Buy it solely for that.
However, what separates this material from others is the level of detail and consistency that the material has. This isn't just a module that you can quickly run a bunch of teenagers through, this is foundational material which adds background, color, and depth to a campaign. I mean, how often have you seen someone talk about the pirates that live on the islands of the bay?