These work WONDERFULLY!! You can’t see in from outside due to the mirror finish, it has easily lowered the temp of our kitchen and living room by 5 degrees. 
They aren’t an easy install. You need lots of patience, you need to realize and accept that with all the rubbing and scraping you have to do to get them on without bubbles, they will have scratches. I don’t mean rips in the product, but light scrape marks.