The puzzles are fun, definatly the best part of this adventure. If you have a party with some smart characters with good skills, these puzzles will be fun and moderatly difficult. If it is full of meat-heads and charisma based characters then you will likely have some trouble.
The combats are a different matter all together. I can not really get into that without spoilers, but I will try. If it can see you, it can kill you. If you can see it, which you might not be able to, you most likely won't be able kill it. I think that sums it up a bit. Feel free to delete that bit if it is to much.
Definatly will not recomend this for 75% of players unless you have a very varried party with no overlap.
This evergreen is getting a lot of positive feedback, and there is a reason for that, it is awesome! I loved running this, my players loved playing it, and I am looking forward to playing it myself in a few weeks. The only thing that keeps this from being a 5 star game for me is how much prep work it takes. This can not be run like the Confirmation and Wounded Wisp where you have the players roll at the table. You need to spend about an hour or 2 before hand doing prep, rolling everything out, setting up your hidden stuff, and just figuring out everything. Lot of fun but a lot of work.