I am not a builder but my two Martin Keith (he's the builder) Elfin 5 basses (fretted & fretless) both have ziricote fingerboards. I love the look of them, and the feel is very smooth with wonderful growl on the fretless. The fretted Elfin 5 has an amazing amount of sustain, the B string rings on for minutes, really.
Check in with Martin if you want more info on his use of ziricote.
http://www.martinkeithguitars.com/