The verdict is in- we love mass loaded vinyl. It has worked SOOOO well to help reduce the sound transfer from the basement to the first floor. We now have downstairs neighbors, and we hardly ever hear them. They had a birthday party this weekend, and we could hardly tell they had company! They also report that they seldom hear us. It's heavy, it wasn't a treat to put up, but it was very worthwhile in the end. A+. See our link above for product and installation info.