Difference between non and factory terminated

If someone gave you a good factory terminated power cable, and someone else gave you the same cable, but they terminated it at both ends themselves (let's suppose they done a reasonable job), could you hear the difference? How much, if any, difference does factory termination make?
I would rather hears some credible arguement. Tossing out an insult so lacks imagination, or any suggestion of intelligence.

You can do better, right.
10-28-04: Didactically
I hear you. I am using a $15k system

What system is that? its not the one you have posted(unless your using 1996 pricing :)