First of all, I wouldn't say that I hate Jaco, but have never been such
a big fan of Jaco.
That said, I'd been very much longing for that J-bass sound, and this was my first J-bass, actually. The Jacaranda (Brasilian rosewood) fingerboard had fret wires on them, but I made it a fretless when I got a real '63 Jazz later.
After it was defretted, I needed to lower the string height, then I needed to put the PU away from the strings to avoid too much magnet pull... Then I find that the front PU is too low to rest my thumb on. Then I decided to remove the pickguard, and, you see, now it looks like if it is a Jaco model..... Oops...
Passive, but the PUs were replaced with VooDoo PU ('60s black). Fingerboard is coated with urethane. My main fretless bass so far.