I was recently asked how the listening experience goes in a group setting. If you're of my generation and of a certain geeky nature then odds are good you like to MST3K what you're watching. Ultimately I think it's inherit in our nature to comment and once someone gets a good one off the show is usually rolling to see who can come up with the best one.
For the purposes of this project you have to be of the mindset that you want to at least attempt to hold the comment to a minimum if you can't keep completely quiet. We tried having an audio listening group before and we found it didn't work after you reach a certain number of people. The lack of visual stimulation doesn't help either.
We're coming into this with the knowledge that we're going to attempt to pay serious attention, hence why a lot of the socializing is done beforehand with fine food and fine beverages. That's not to say the comments don't come. With Sirens we just had to say something to maintain sanity. And I don't think we'll ever be completely quiet. But I would say for anyone trying to do something similar that it works better with a small group.