Does it work? We hopefully get our glass fixed next week (only taken 4 months) so I can at last put our roof seal in. Even better if they manage to fit the glass evenly. Then I will see what else is needed - road noise from rear would be biggest bang, but I suspect biggest buck too.
It certainly made a difference to the sound of doors closing, reduced wind/water noise from the front doors. It’s still a loud cabin (which was reinforced to me by spending 4 days in a loaner S). If you find a good solution for the rear let me know.
One interesting observation - I had my headliner replaced in my August 2019 delivery Model 3 a couple of weeks ago. The replacement headliner is noticeably plusher. Way more foam inside. I have to imagine that’s part of the cabin noise reduction efforts.