I have a 92" elite motorized screen with no complaints to screen quality (1.1 gain white). I have been looking to up grade to a 120" but I don't want to get another motorized because they are expensive and I never put it up anyway (dedicated theater room). The guy at projector people said that the reason for a tension screen was for movement from air ect. He also said that it wouldn't be wavy any truth to that?? Also what is the seating distance recommendation for a 120".