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One advantage to black is since you do see all its flaws and swirls, it might force one to take better care of the finish. I know with white and lighter colors, a lot of scratches build up and get left simply because "no one can see them." Stuff like that makes me nervous on my GFM, so I treat it like it's black. So at least with black it's easy to spot. The lighter colors are a chore to inspect and often get neglected.
While somewhat true, GFM is also an interesting color to keep clean. It really gets an ugly dull look to it if allowed to sit too long, which while not as bad as black, certainly doesn't do the color effect justice.
In response to the OP, though, if it wasn't GFM and I didn't already own a black car, I would have likely bought the IS in black.