They're great sport dogs, I can say that much. I don't know much about herding, so if you are defining a working BC as a herding BC, then I can't speak to that.
But in obedience and agility, yeah, they're good. These are dogs that deserve top-notch handlers.
ARCHMX TDCH Pongu the Insane, CD-C, RN, RL1X5, RL2X4, RL3X2 (GSD mix, b. Apr 2010)
Crookytail the Tigerwuff, RL1, NTD (Akita mix, b. Jan 2011)