Rear disk brakes To do or not to do?

A few more bucks?
Many of the kits I see are at least $600. I made the switch to rear discs with a kit from Dr Diff. The only gains I saw were cosmetic. The car stopped great before with rear drums. If you are only interested in a better looking brake system, go for it. To me, the only instance where they may pay off is on a road course.