G'day, With the gears in motion to replace all our windows next year, I've been reading and researching on how to proceed. In doing so, I came across some information on vacuum insulated glass windows - VIG windows. Does anyone know if these have actually gone into production yet? Guardian seems to be the big name that comes up, but I can't actually find anyone who sells this product. No answer back from Guardian yet. A window that insulates as well as a 2x4 stud wall may well be worth waiting for... Wonder what the cost will be... Sean.