Although I received the acoustic quality of inserts, I would rate the effectiveness at about 2.5. It does seem to somewhat muffle the noise level of normal conversation but not to the level of satisfaction considering the amount I paid and the length of time I waited. I did follow the installation instructions and video very closely. I am impressed with the insulating qualities and the fit to each window. The secure shipping was impressive and appreciated but wasn't happy that there was no assistance offered by the deliverer to bring the huge parcel inside, acting on your instructions, the driver claimed. I did see on the video that other customers were hauling in the parcel in themselves and I think you should make this clear that it is a requirement you are alone as far as bringing in the delivery yourself so you can arrange for help or plan on opening the parcel and bringing in the Indows piece by piece.