I'm hoping to get some opinions from anyone who has chosen to use Wincore 5400 vinyl windows. I have the opportunity to replace my very old single-pane windows with Wincore. I'm curious about how much I should be expecting to pay. They are offering "60% off" as a special educator program but the quote we've received is still coming in at an average of $680 per window, installed. That seems to be on the high end to me but I don't know enough about windows to compare them to the quality/cost other brands such as Pella or Andersen. The quote given is for the following size windows: 1 slider, 59x47" Double hung: 1 - 58x58" 1 - 47x58" 2 - 72x58" 1 - 70x58" 1 - 23x59" 2 - 17x59" They will be Low-E, Argon-filled, ETC dual Low-E, ETC Low E366, divided light (the grids between glass panes), 1 will be opaque/obscured glass. We're supposedly getting all of the "upgrades" for free as part of this program. They quoted the retail cost of these at nearly $13,000! Any advice?? Are these windows worth that much or am I being fooled??