I contacted Sunview Patio Doors regarding a patio window that had developed condensation. The window is supposed to be under warranty, however I was told that as I am not 'the original owner', the warranty no longer holds. At the time I contacted them the window were 9 years old.
Oh well, think again, next time you get windows from this company as an owner, when you sell your home, all your windows' warranty will be null and void.