The Hebert Miner line of hackle is but one "breed" of bird that Whiting offers. The main line being just plain "Whiting". The Hebert line is characterised by lower fiber density(not as many barbs per inch), true natural colors, and somewhat larger sized feathers and barb lengths, as well as softer barbs. The Whiting line, however, is what you have probably been hearing about. Whiting hackles have an amazingly dense fiber per inch ratio,stiff barbs, long, thin feathers and a variety of sizes on a neck. The only downsides I've seen is that they need to dye many of the colors, rather than getting them from the bird naturally, although, I actually prefer their dyed dun necks to the natural tones, as they are much more consitent.
The (Whiting) "American" line of birds are bred for larger, webbier feather more suitable for bass and saltwater flies, and are really pretty useless for dry flies.
I'm sure Conranch offers some nice stuff too, but I don't like to buy feather sight unseen...
Hope this helps,
Charlie