We replaced approximately 50 windows in our home with Okna 500 DX double hung vinyl windows. The windows are beautiful, quiet and our home feels very comfortable. We talked with at least three different window dealers and considered NT presidential windows as well as Anderson. We absolutely made the best decision! While the window quality is important, who installs them is equally if not more important. Randy and his crew are honest, professional and very attentive to details. They were in our home for 6 days and each day when they left, their tools were neatly stored and there was no trash anywhere. In this day and age, it is refreshing to find a company that prides itself in quality work and great customer service.