I've now run this several times and each time has been memorable and a lot of fun for everyone. It is well balanced with difficulty, some dangerous possibilities that can be mitigated by attentive play.
One of my favorite encounters in any scenario, make use of your right to secret rolls GMs!
The aerial grappler is a neat encounter, potentially very dangerous though if the GM doesn't mind the tactics. All three groups I've run through have handled the social encounter differently, most of which were very entertaining and worthwhile. Oh and the ritual, man there are a lot of opportunities to mess with players in this scenario.
The final fight is memorable and potentially challenging if the players aren't paying close attention to their environment. I do wish there was some 1-2 tier scaling for the lava damage though, even if that doesn't make a lot of sense. Killing a level 1 character in that manner does not feel good. Good ending to the scenario too, be sure to whisper creepy Moloch things to PCs from the great beyond and play up the danger if any of them get "stuck" to the portal.
There are a few mechanical warts in this scenario, but they can be easily covered up with a decent amount of preparation. Not enough of a problem for me to deduct a star, the scenario is just so much fun!
