Upscaling can be ok but I honestly hate the way upscaled content looks. Faces end up looking mushy and motion is often awful (since some nerds think the frame rate needs to be interpolated, which makes it look awful.) So I still watch the DVD SD rip which is good enough for me.

I won’t poo poo the idea of watching it upscaled if that’s what you want, but I’d stress that you should keep good notes on your files (via filename) so that you know what modifications have been made. This is only because metadata of video files are too lacking in this new era where videos are often modified, and it’s becoming really difficult to fine the original authentic files for anything these days. Assuming you care about that sort of thing.