I live in Chicago right next to a busy street. I've been looking for high STC rating (45+) double hung windows (size: 70 x 32) but they cost about $4,500 each (excluding installation) and I need 3 of them for my bedroom!! I came across Indow's demo video on Youtube and immediately reached out to them. After a few email exchange with the local dealer to get the pricing, a measurement appointment was set up. A month later, I got my acoustic grade Indow. Words cannot describe how happy I am and how quiet my room is now. The product is worth every single penny (about $700 each) and I wish I knew about them earlier!!!