Coolness.
I will say this: the stock pots in the VM leave a bit to be desired. Mini Alpha pots. They do work, but the tapers are pretty non-existent. I swapped mine out for full-size ones, all audio taper, and not only are the tapers smoother (still not perfect), but I get a bit more discernable top-end out of the neck pup. Also, wanted to have the more standard-looking plastic turn knobs (kept the brass ones for my project P-bass).
Aside from that, not going to change anything on the bass. I was contemplating taking out the 'Jazz Bass' lettering and replacing it with the late 60s Jazz Bass lettering (because it looks so cool), but nah. Why mess with it now? I was thinking of getting some pre-CBS style tuners, but the stock ones are perfectly fine. They're pretty much the same as on the standard MiMs and from what I can see the American Special, and even the Sire basses.