I have Simonton... They even came over, a crew of 14, to prove that their windows were performing.
Well they passed, according to AAMA specs.
The problem is I have so much air coming in I will still have to use 3M kits this winter.
My opinion... By the best windows made stay away from windows you've had a bad experience with and if you want to make some quick money buy stock in 3M because as long as I'm in my house w/ Simonton windows I'll have to buy 3M kits every year to stay warm!