I met with Marc, a very knowledgeable, and likeable salesperson for Quality First Home Improvement. After his window demonstration, "my decision to replace every window with double pane, and install a sliding glass patio door became very simple!" I was amazed that immediately, the windows improved temperature comfort, and noise reduction for my home. As far as the installation itself, "their workers are very skilled, did an impressive job, and thorough clean up!" My relatives also love the windows, and they'll be contacting Quality First very soon!