D'Addario doesn't pay me for this (man, I should really ask!), but Chromes are in a league of their own. They have flatwound thud and fundamental, yet also a halo of (never nasty sounding) presence, not like trebly rounds at all. And they never lose that, I've had the same set on my Washburn AB-20 for more than a decade, they still retain sparkle.
They are also smooth to play, not yucky like some old fllat sets can be, Labellas especially. The only drawback of Chromes is that they make bending a real man's job, they're stiff as hell.
Ñow, does anybody have Jim D'Addario's number?