Series 2
Cleans up pretty nicely. Needed a lot of noise removal, plus colors would occasionally change frame-by-frame, which I fixed. There's some artifacts, but I kept the settings low so they wouldn't be too bothersome. Again, it can be a good trade-off.

Series 3

There's a noticeable jump in quality once you start playing with the colors, but I'm still trying for the right luminosity to make the dark sections look right without crushing them.

Series 6

Cleanup becomes easier in the recent series, down to making the colors pop out more. Plus with the widescreen, this is where the upscaling really starts to make a difference.

Series 9

My first attempt at one of the digital video series. It's a fairly easy fix, actually. The colors are basically the same fix: red down, blue up, saturation up.