The Shaft is a big thing in a small package and the package is very attractive. It's layout is easy to follow for any referee and it's densely packed content guarantees lulls in the action will be sparse.
The theming of the mission does a good job of balancing the paranormal and the grounded, which makes the enemies and threats all the more impactful. A new take on a "crafting" system also gives players a tempting choice to risk danger to gather materials for useful weapons and tools.
This would be a great fit for any FIST table and would be a useful intro for a beginner referee.