Got my doors and windows from DoorWin and they are amazing! The price is probably unbeatable. Everything was made to specification, nothing missing from the order, nothing damaged during shipping. I opted for triple pane windows as the price was not that much more. they have insulated frames and the tilt and turn windows have triple gasket seals. they also latch in several places, all controlled by the 1 turn handle(very secure). Khloe was my rep and she was great.
The downsides: I can't understate how heavy these windows are. My biggest 6x9 window was just over 600lbs. they do take a long time to get and the shipping container got delayed about 10 extra days. Of course any large custom order isn't coming quickly and I was aware of the approximate time. the one thing I didn't count on was having to rent a forklift to get off the delivery truck.