The coated fretboard emulates the Jaco sound, as he coated his converted fretless jazz bass wtih epoxy. For a good recent sonic example of this sound, watch on Showtime The History of the Eagles. Timothy B. Schmidt plays one on NY Minute. I own 2 Buzz basses myself, a standard one with extra treble and bass in the preamp, and an EZ-Q equiped one. They are very comfortable to play and the sound is still quite distinctive. Mike Pedulla is terrific with service as well.
I hope one day to own a 5 string Buzz, but first in Alembic land ....... a project yet to be started with woods reserved (and paid for).