Inserts seem to work pretty well at cutting down some of the road noise. Cost is very expensive, but not many alternative besides maybe trying to do it yourself or replacing windows, which are both not great options. Construction seems pretty solid, would like to see the "D" rings on all corners and maybe some on long spans in order make adjustment to the insert once in. There was a minor scratch on the large insert which I didn't notice until the insert was backlit from the window and was too much trouble to remove and try to buff out. Overall, shipping was fast, sales representative was quick to answer any questions. I would consider purchasing more for other windows that are affected by road noise.