Well constructed and good appearance. However, because my Indow fits into a small window, I had trouble installing them at the corners where small holes in the seal has occurred only in the corners. I have reinstalled them attempting to eliminate the hole, but nothing works. However, I have noticed the difference in reducing the cold single glaze window. I have attached 1 photo of the hole at corner and 1 photo with the corner rubber lapping out over the frame corner.
