Not much unless you are trying to buy one. I've got a nice spare one that I took to a swap meet and didn't get an offer on. Any offer would have taken it to a new home.
If the truck has a stock height cab the stock seat when redone right is the most comfortable one you can have in there though. It might not have the "Bubba" factor that a newer seat has but your butt and back will like it a lot better than most of the replacements that guys stick in these trucks.