I liked the PDF so much of this, I bought the deluxe hardcover edition later. I was in a game that took place in the 1100s and went on to modern day, and having a lot of the lore and continuity here helped me (even though we ended up homebrewing a lot of it as this book hadn't been available at the time we started). The adjustments to koldunic sorcery are also local, enabling Storytellers to create their own kraina should their games need them, and the flavor of the nights and descriptions of hold of fear in the medieval era are amazing.