[quote name='Steve_K' post='70713' date='Oct 7 2007, 05:55 PM']Hmm - not filling the gaps is bound to throw the feel off a little, and may not allow for perfectly smooth slides... If you find yourself getting on well with the fretless playing, I'd suggest going back and finishing the fingerboard off properly.
On the plus side - nice to see someone new turning over to the dark side! [/quote]
I do already have a 5 string fretless acoustic bass too (which can be heard on the recordings at my band's myspace, below), but I can't use it live because of feedback.
The slides are perfectly fine, probably because I am using threadwounds which aren't affected so much. If I start to find problems at higher volumes I will certainly finish the job, but I'm lazy as well as impatient so if there continues to be no problems I will probably just leave it. I've sanded the fretboard very slightly just to soften the edges where the frets were, too.