Before I go on, there was a TPK when I played, so it might colour my opinion of this module somewhat.
Played at the lower tier.
The concept for this story is interesting, but in practice it just isn't very exciting or fun.
There is quite a lot that is known to the GM only - and may never become apparent to the players.
The combats range from being manageable to being unbalanced - one in particular leans heavily on the side of unbalanced.
There is just a few things in this scenario that scream 'cheap' or 'unfair' to me.
I would say play this if you want your characters to have a decent chance of dying.