Love them. Very smooth, I smoke them as a "palette cleanser" between heavy latakia and/or oriental blends. But honestly I can't tell much difference between the Dark, Ebony and Special varieties. I think I prefer the Dark.
They're totally different, the dark is awesome, really really smokey flavour, whereas the special is way smoother and not as strong but very very nice. I haven't tried the ebony, but it depends if you want a smoother one go with the special, whereas if you want a bit stronger one go with the dark. Personally I'd get them both, but find the dark more to my liking, but the special is awesome also. But they're quite different. The dark is 5 va's blended with cajun black whereas the special is 2 va's with the cajun black.
Cajun Black is the first new pipe tobacco component in more than forty years. It starts as Virginia seed, grown in Kentucky. Then smoked and finally pressed and cured in barrels the same as Perique tobacco.