This is a fantastic setting for OSR gaming. It just oozes campaign ideas and local flavor.
It is completely open game material that pther can build upon. Plus, the pdf version is free. This is easily one of my favorite, new products.
Disclaimer: I own Brave Halfling Publishing who publishes Delving Deeper RPG which this product was designed for, but it can easily be used with any FRPGs.
[5 of 5 Stars!]