The acoustic grade window inserts reduce the noise in my apartment by a noticeable degree. Overall, I am quite pleased with the inserts. It has been a little over a month now and my quality of life had undeniably improved with the reduced noise level. The only snag in the whole process involved the inserts for a very large front window. These particular inserts are an EXTREMELY tight fit (not in a good way.) So much so that the compression tubing on the corner of the largest insert is splitting already. That was disappointing. All the other inserts from my order fit easily into their window. To their credit, Indows offered to replace the tight-fitting inserts. I declined knowing the original inserts would be destined for a landfill. I can live with the tight fit. I am a bit concerned that the mitered corners on the compression tubing will not be durable particularly on the inserts that I am popping in and out on a daily basis (this is necessary for temperature regulation.) Based on my interaction with Indows so far, I trust they will continue to provide stellar customer service if that ever happens. The employees at Indows were all extremely helpful and patient and my experience interacting with them was 100% positive. It has been a pleasure to business with Indows and knowing my purchase is supporting a small business entirely based in the US is an added bonus.