To be perfectly transparent, I'm also a Cult of Chaos member and have read the first two of this adventure and run the first one. I stopped there since my group decided to play a different game for now and I wanted to get as much of the discovery experience as I could.
This run through was a LOT different than mine and that is awesome. This first part is so open that there is room for swift action and also for investigation. The party split did feel problematic at times, especially with the Note system being used so heavily. I had no idea what went on with the other players and then there wasn't much IC reason or time for the characters to sit and discuss everything that had happened. That's not a bad thing, as it helped inspire the confusion and fear that the characters were experiencing, in me.
Having so many questions posed in this scenario, and our characters having so little opportunity, there at the end, to try and figure things out was awesome. I can see Angel going back there in 6-12 months, better prepared, trying to get answers to all the questions that nag at him from the back of his mind.
Simply put, I had a blast. I'm looking forward to the next installments in this series.
One little "negative" that I just thought of: In this scenario, there was very little pressure for us to explore our character's backstory. Who I envisioned Angel to be at character creation really didn't matter in this scenario, because we were far away from anything we knew that tied us to those details.
I hope that helps.