Black is a shape and surface absorber, that is the only thing I don't like about it. And that you never know what's underneath.
The RW Sig is a tool and meant to look like one - its originator always had that relationship to it. I don't think Roger Waters considers himself a bass player, he sees himself as a songwriter, lyricist, musician and multi-instrumentalist first. That is not to knock him, I lke his playing. Watching him live, he hits the strings quite hard and a bit angularly, but whatever he plays has attack and bite.
Of all the black basses in this thread, I like the Peavey T-40 best.
PS: Just as Bob Ezrin invented Simmons' iconic bass run to Detroit Rock City (lifted from a Stax recording, Gene Simmons rehearsed all night to get it right, you can tell by early live versions of DRC that he was not yet quite comfortable playing it), he is also responsible for the similarly immediately recognizable bass line on Another Brick in the Wall (surely stolen from another black player too!). The pre-demos to ABITW (now available on the remaster of The Wall) contain nothing of the sort as regards the bass part. That is not to say that Roger's initial bass lines were bad, but more in the classic seventish British blues rock mode and quite a bit busier.
And speaking of Bob Ezrin: A dream of mine has come true, he will actually produce the next Deep Purple album!!!