You should know that the visual effect is influenced by various factors, like your display resolution, the display size, DVD resolution and the distance between you and the TV. A 480p video can show quite different visual effect when you play it on a mobile phone or on widescreen HDTV. So, you'd better not upscale DVD resolution to 720p, 1080p or even 4K. Even if you have up-scaled it into a high quality, the video quality will not be improved at all. Normally, DVDs will perform the same as the original one, not better and not worse after up-scaling.