Actually, after looking more closely, and I should have already known this but I've been away from things for about a year on a job that didn't really allow for internet access so I kind of got out of touch with the tech side of things for a while there, and forgot a good deal that I used to be in touch with on a daily basis, I realized that it does NOT have any performance advantages over the standard NF-A15 PWM. The 1200RPM spec given for the NF-A15 PWM is in consideration of using the low noise adapter. Without it, that fan too had the same specs as the NF-A14 PWM, so really the only difference is color.
For me, that's still enough to make it worthwhile though, because I've taken many NF-A14's and 15's, and colored them black using rattle can vinyl dye, and while they look good and still perform very well, you know there has to at least be SOME minimal performance differences due to the additional weight and drag on the fan blades from the surface layer of vinyl dye which is really just a specialized paint and we know paint diminishes fan performance to some degree in all cases.