This is a very well known nad loved suppliment in the community, it adds depth to the Tome of Strahd, it adds subplots and gives the players information about Strahd that they personally experience through their characters. I give it 5/5 stars and am delighted to do so. That said, I didn't use it. It doesn't match my style of play, it extends an already very long module, and I wanted to do something slightly different with my Tome of Strahd. Unfortunately, I wasn't able to really pull anything useful from this suppliment, but that's entirely on me. This is either a 0% useful or 100% useful document, and I recommend checking it out to see if it fits in your campaign.

I could imagine running it in future runthroughs of the game.