DVD Upconversion:Noticeable difference in picture? or selling gimmick?

I have a 42 plasma, so I was wondering if I should buy a upconversion
DVD player. Will I actually notice the difference or is it just a
selling gimmick. Any samples on the web showing the difference, or
would that not be possible to do, we all have different type of
monitors/ lcd.
Thanks.
.

Relevant Pages

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