We have had them on all of our Montanas to date.
We believe they do reduce outside noise but the real reason we won't be without them is because we camp in cooler temps both in the spring and fall.
Just tour a campground when the temps are near freezing and one can clearly see all the fogged up single pains laden with moisture.
That is our story and we are sticking to it.
Darwin & Maureen DeBackere
Minnedosa, Manitoba, Canada