never bought them, about to buy them as well as fix/renovate existing broken windows to save having the fully replace all of them..I hear a huge cost is when companies just buy the windows from the factories that make them so try to cut out the middle man by finding a local firm who actually make the windows on their site, some do and you should get a better price, of course the quality needs to be checked and the paperwork saying they are registered fitters and all that the windows pass all safety checks etc