Bought enough acoustic inserts to cover my entire second floor (open concept) and my main bedroom. A few of the inserts didn't fit as snug as the majority but they seem to be secure. Bedroom (third floor) was a nice improvement. Second floor left a little more to be desired but it was still an improvement than without. I'd guess 35% noise reduction with my double pane windows. I do plan to buy inserts for the remainder of my windows.
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