I'm asking those who have used any of these software packages opinion.

Which is the best and best value for de-interlacing and color correction?

Pros/cons?

Magic Bullet
http://www.redgiantsoftware.com/magbulsuit.html

Natress
http://www.nattress.com/Products/filmeffects/filmeffects.htm#

RE:Vision Effects FieldsKit
http://revisionfx.com/rsfk.htm

You'd prob. get more feedback on both of these threads if you posted them under the editing area of the boards. Deinterlacing and color correcting would fit more into editing than the Alternative Imaging area.

Try the film look techniques section.