We built our home 10 years ago and installed Shelter windows they have been nothing, but problems. They leaks air air, have rotted right in place. They are twisted and gasping in places. They have been replaced in pieces, sash and even a whole window, that was completely rotted through.
We were told we didn't finish them correctly even after we stained, varnished and hand waxed. Most likely we will be replacing all our windows before they are 12 years old. They windows were said to be as good as Pella. Didn't fair well with Better business bureau.