Those old ones are a great deal at the right price. I had no problem with keeping the ebonol fingerboard at the proper relief, and I live in Ontario, Canada. We have wild seasonal swings in temperature and humidity that challenge poorly-seasoned necks.
It's also a great platform for cheap, effective mods.
One of the most cost-effective things I did to mine, was to swap in better string saddles. The stock saddles on recent VM's are machined from billet, and there's little or no improvement to be found by changing them. But those original, SD-equpped basses have cast pot-metal saddles.
Swapping in a set of Allparts steel "threaded" vintage saddles (or some used Am Standards, or whatever you can find used for cheap) will increase sustain and give a little more detail. Not just placebo effect, but an actual, audible difference that I could hear in before-and-after recorded samples. The only thing you have to do to make US saddles fit, is to open up the holes in the baseplate a fraction of an inch, to make room for the beefier intonation screws. You don't even need to pull the baseplate in order to do this!
Another cost-effective mod (you can't beat free), was to adjust the little spring-steel shims that tension the tuners to reduce the slop. Half an hour with a small screwdriver and some needle-nose pliers, gets the stock ones feeling just as good as Am Standard tuners, at no cost to you other than your time.
You do sometimes have to be careful about replacement pickups on Squiers, due to the length variations between US, Mexi and offshore Jazz pickup patterns. This has all been extensively documented over on the Squier modification threads.
Speaking of which, the other mod I did to mine, was the Dimarzio Area J noiseless pickup set. The bundled pair is stupid cheap compared to most Duncans, Fralins, etc.
Obviously, people vary in terms of what sort of Jazz bass tone they prefer. That said, I flat out LOVED the tone I got from this bass after the Area J swap. The reduction in noise was helpful, too.
There were two reasons why I let mine go:
- I have an on and off, love/hate relationship with fretless
- I'm a 5-string player who occasionally dabbles in 4-string instruments. The minute I see a good deal on a five string, I tend to sell my 4-bangers to finance the deal.
That said, my friends were fighting over who would get the VM fretless. It has been since used on a number of recording sessions, and I still occasionally try to buy it back from the lucky S.O.B. who ended up with it.