We had eight double pane windows installed by Quality First Home Improvement, and they're easy to operate, outside noise has reduced, and our home stays cooler. Marc, the sales person from Quality First was very nice, professional, and informative. Their installer, Kevin, did a great job, and even came back to reseal the windows, because we have a problem with spiders. Kevin's helper, Jose, did a great clean up job, and we're very happy! We've received many compliments from our neighbors, and we'll contact Quality First when we're ready to install a new sliding patio door.