I originally ordered Indow inserts due to loud cars in my neighborhood, and after ordering, the culprit moved away. Still, I installed 2/3 of my inserts due to laziness around moving my window shades at the same time, and I am very, very impressed with the sound reduction. I made a recording of audio blasting through a speaker in the room, behind the window pre-insert, and with the insert installed. The results are incredible. If the old neighbor decides to come back for a visit, I probably will not be awoken again. Customer service is great, price is on the expensive side, but the team does work with you to make it feasible, install is easy, and it is much less stress and hassle than getting different windows that wouldn't do as good of a job. I would definitely recommend Indow inserts to anyone having sound issues in their house or neighborhood.