This, my friend, is basically another matter of Oppinion. I'll do my best to inform you, though I know others here know a lot better.
Basically, they use carbon fibers to make those necks, I believe. The thing about this is, instead of wood, it is not, and never was alive. So, there's no bending, stretching, bowing, adjusting, any of that. This means that you never would have to adjust your bass again due to weather or humidity.
However, many have said that this leaves the bass with a less 'natural' feeling, as the neck doesn't really move, or respond, like a wooden neck. I've heard tales that even with the hardest slappers you can't feel any movement through the neck like you can with a wooden neck. That's what I've heard, not what I know.
Apparantly it also seems to give more attack to the sound, because of the material, all graphite work I've heard is a lot more snappy. Heard Californication by the RHCP, or perhaps later Dave Matthews Band work? That's a graphite neck, same bass even.
Whether or not it's something special... Well really that just depends on what you want. Essentially the idea is great, I mean, you don't have to worry about adjusting your neck. Though, it does still feel different, and it's definately not as natural as your regular wooden bass.
Anyhow, hope I've helped more than hurt.