does yours have a leak that cant be fixed easily? does the PML pan cost less than a Ford one?
if so, it might be worth it. (altho just to fix a bad pan I would probably go to the junkyard and get one...)
If you are going to buy it as a dress up item for the truck to make it look good, I would say that would be a personal preference and if you like it, go for it.
I doubt you will get any performance gains from it over a stock pan. if it has fins on it, possibly some more cooling capacity.
Post up a few pics or a link, I am curious as to what it looks like.
AJ