I use DR Black Beauties on a fretless with an ebony fingerboard (not an Alembic, but a really nice bass nonetheless). Since it's an unlined ebony board, from a distance it looks like there are no strings on the bass!
The tone from the strings is excellent and the coating makes them longer lasting (still on my first set.... about 6 - 7 months) and they are not damaging my fingerboard.
I may look at switching to DR coated colored strings for my other basses, including my Alembics.
Peace,
James