I didn't really have a good reason to change mine. I had a clutch cover with a fully functional, but a bit discolored by age, assembly. I had another with a shiny, new-looking assembly. The better cover had the lesser assembly, so I put the shiny one in the nice cover. Like I said, since you can't see it when the clutch is assembled, the switch was pretty pointless, except to use the nicer looking parts.
Patrick