I bought Bassjamm's '99 USA Jazz on Saturday. I love it so far, best 4 stringer I've owned I'd say. Still fine tuning it to my heavy handed style, but nearly there - while I was tweaking the action etc earlier I recorded some soundclips, which are below:
[url="http://media.putfile.com/Jazz-groove-10"]Jazz Groove[/url]
[url="http://media.putfile.com/Jazz-Groove-2"]Jazz Groove 2[/url]
[url="http://media.putfile.com/Jazz-Space-Cowboy"]Jazz - Space Cowboy[/url]
I'm loving having a decent 4 string for a change - the neck is refreshingly thin and easy after using 5s for a year. I'm looking forward to using this with the band once I get a hipshot fitted