Was told by a NZ Engineer that they might be great as a marketing tool, but the black ships are a pain for the engineers - they got a lightning strike on the black 777 and whereas with a white hull it is easy to see the burn marks etc, it took them ages to go over the a/c to look for damage and especially at night, the black "soaks up your torch light" and makes it difficult to spot damage.
They do look sharp though !!
Role on.....