I've always wanted one of these, but never had a real reason to get one. But I've found myself listening to a lot of traditional jazz the last couple of years, and so I thought I'd give it a shot.
It's quite a different animal from the bass guitar, even the fretless. But I'm enjoying myself a great deal as I work around the fingerboard, trying to find my notes. I got a bow with it, and I am trying to work with that too, but it still sounds very much like a sick cow when I use it.
Right now I'm working with a book that I used to use during bass lessons in the 80's - The Evolving Bassist by Rufus Reid. It's a very good book, and he included fingering and bowing instructions with the excersizes. Still I may have to spring for lessons to make sure I'm doing it right. I wouldn't hurt to have some direction too.
My plan is to keep renting this for a while until I decide it's for me. The shop I'm renting it from has a nice policy where 100% of the rental fee gets applied to purchase should I decide to buy one later. I'd like to get a hybrid (solid top, ply sides) or, if I can afford one, a carved bass. But that's in the future. Right now I just need to figure out how to play in tune.