So my experience with Indow is a bit drawn out and involved. I've worked with several people at the company, all of whom have been extremely professional and helpful in their responses. We initially wanted to go with the acoustic panels to help reduce the noise coming from a train station directly across from our house, and decided to do a test run of the first floor. Unfortunately, the panels did not seem to make a difference in our specific instance. Either noise was coming through the walls as much as they had been through our existing windows, or the sound was coming from another location. I HIGHLY recommend that you perform acoustic testing within your household to determine if the windows are ultimately the biggest transmission region of noise from the outside, because they've done enough testing to prove that they will work if the windows are where the noise is coming through. Our home is new construction (2017), so we operated under the assumption that it was sealed up fairly tight and that the windows were the "weak link". Performing some acoustic testing ahead of time would have saved us from purchasing panels that weren't necessary. That being said, Indow worked with us to ensure that we were happy, and we went on to buy additional (standard) panels for the rest of our house. The panels (regardless of grade) do an amazing job at reducing the thermal intrusion from outside, which is very evident in the colder months. I can walk right up to any window and basically put my face up against the insert before feeling any coldness from the outdoors, on single digit degree days. This has also helped with sealing off the windows and preventing humidity from either entering or leaving the house (depending on the time of year). You should end up seeing a return on your investment fairly soon, depending on the age of your house and your current energy bills, and you'll be a lot more comfortable all year round. I highly recommend both the company and their product, and would definitely purchase from them again should we ever move.