It is no wonder Silverline Windows are bad. They come in build their factories ( just had one open here last year) then proceed to hire and not come across with wages. They treat the workers worse than dirt and hire every itinerant worker in the area that came here to work at other places. Most don't even make effort to learn English.
If the windows aren't any good blame it on a company that doesn't care about what goes out the door as long as it gets done without them paying out much.