Has anyone dealt with fiberglass replacement windows? We have 60+ old drafty sash windows(the kind with the heavy weight)and are thinking about replacing them. Along with better insulating, how much will these guy's increase the value of the property. The salesperson claims they can be painted and stained to match the woodwork. Will this work as well as wood or are we talking major pain! Any alternatives to fiberglass that will work better? Thanks Rick