Voice in the Void is a scenario that touches many pathfinders very close with the creepy atmosphere and haunting, horrifying madness. This is a scenario for everyone but it truly shines when you are willing to play a little dark, slow music, and when you are willing to put the extra effort in getting involved instead of reading everything in a monotone voice.
I will start with the group at the gaming store I GMed for absolutely loved it, their response was overwhelmingly involved with a wide mix of laughter and shock.
Just from describing some of the eldritch horrors I had a player barring doors behind them and every player was as Paranoid as the most hardened veteran.
I feel that for groups that have a tendency to linger in every room this scenario could easily go upwards of five hours, so be prepared and remember that this is not a social scenario so encourage inter-party roleplaying and thematic flair for your more social players.
Overall Voice in the Void left everyone in the party excited and deep in thought about all the things they ran in to but couldn't delve deeper into.
I have played in and run a number of scenarios, however the first time I ran this as a GM was less than stellar.
We played tier 4-5; and without going into spoilers I felt that the story was lacking and the combat even less exciting. The fights were trivialized by having a cleric and while it's nice to have players not have a clue what they are going up against all the way through the BBEG, it is not the best storytelling experience.
The lazy use of Obscuring mist to combat action economy is one of my least favorite scenario tricks. The combats were exceptionally straight-forward, which may appeal to some players as every group is different.
I also liked having a BBEG with the background and motivation to coup de grace players, though I did not take the opportunity myself.
I have since run this scenario in tier 1-2 for a group of players, and despite all the thematic ideas that I played in greater detail the second time, I still found it to be boringly easy for a group of 4 and I can see why this was held back until the end of season 3 to be released.