Herefishy,
I have, and use, Whiting CDL, both hen and rooster, that I use for hackle on wet flies and some tailing on dries. That being said, and in no way intending to sound snobbish, the feathers that are actually from Leon, Spain, are far superior to what Whiting sells. The feathers are individually plucked from live birds and the birds go back to grow some more. The colors, stiffness and sheen that these feathers display are tremendous, and yes, you can tell the difference. Whether or not the fish can tell is another story entirely.
I use the light, medium and dark CDL for different flies, so purchase a few packs of each color every year.
With all the talk of CDL, shouldn't the hen birds feathers be called Galena de Leon (Hen of Leon) instead of Coq de Leon (Rooster of Leon).
Just my opion, of course.
REEW
Happiness is wading boots that never have a chance to dry out.