Wow, this one really sparked fear into my players - it is fiendishly haunting and terrifying within.
The concept is excellent for creating a level of horror in your players as they flee to this mill, but the mechanics of the whole thing (traps, encounters, etc) are horribly messed up and will require an hour or two of work to fix or make sense (provides no stats for two key encounters inside, forcing you to make them yourself, which takes a fair amount of time).
When I ran this, I had to add some extra material from my own ideas to flesh it out more and make it more exciting, but still the concept was there for me thanks to this product and it turned out to be a very exciting place for my players.
If you are willing to work a bit on it, then you'll enjoy it a lot.
[4 of 5 Stars!]