I am so impressed by the workmanship, the appearance — and by how quiet my house is with good windows and doors. I just had to turn on my furnace for the first time this season and I soon realized just how much better my home retains heat with the new windows upstairs(plus some earlier work I had done on the insulation of my home). It takes almost no furnace time at all to get the upstairs very warm so I actually had to lower the thermostat. I am very pleased!