From what I understand, the problem with screens that roll up and down is that the materal will not stay taught. So when watching a movie the screen material will have waves in it. Maybe that is why some are $4000 and some are $400. I'm sure that the cheaper ones will have these problems. Most people are getting the screens that are hung on the wall like a picture frame because the screen material is stretched tight against the frame, eliminating a wavy screen. HTH