We've had the electric roman blinds for six months, we really like them. They block more light than curtains. They do make access to windows more difficult, but we simply close windows before we close the blinds at night. The seal well against the window frame so they're great for insulation, when they're closed you don't feel the cold rolling off them as much, though double glazed are good anyway.

If you put them over a door they'd probably need to go over the frame and ideally sit above the door frame. Not sure if I'd do that or not.