We spent over slightly over $1000 just for a front bay window. They are double paned. We were initially told that we would get 50% reduction, but later we were told "up to 40% reduction" of any road noise". There was absolutely no improvement in the reduction of road noise. Anything with low frequency noise (tractor trailers, rumbling truck exhaust, motorcycles) were at the same level as before the installation (as determined by a sound meter). Delivery time was expedited when it was found that the dealer delayed sending in the order, so that was good. Customer service was OK, e-mail responses usually within 24 hours We prepared 3 other windows (at some expense) to widen the trim area to fit the anticipated Indows per the dealer's recommendation, but we're not going to order any new Indows due to the results we got from the first set. Not impressed with the results, costs, etc. of this product. I would love to get some sort of refund for this expenditure.