On my L2500 FL (except for a rosewood fingerboard actually the same as etoncrow's, btw) one of the two screws already has slack and stringing through the bridge might be harmful -- I didn't dare to try. I'll certainly do the bolt-down mod when string change is due. Other than that, and a minor nut issue I was able to fix, I feel it's a perfect instrument and quite better than the three other fretless basses I went through over the years, including a Fender J.
EDIT: It turned out that I found the tone best when pups are lowered as much as possible and pole pieces don't stick out, but YMMV.
It doesn't see too much playing time though as I started playing fretted basses more often, so my L2000 and L1500 get the ride these days, usually. Tonally, those are so very different from each other despite their overall similarities, and together they offer offer a broad range of satisfying sounds that I'm still learning to make best use of, already with stock electronics but even more after some mods to the coil switching.
