My Black Madeira suffered the least cold damage in my garage, col de dama noir dieback back to the ground and is sending up shoots, but I didn't protect it properly so I lost much of the wood to rot, I think it should be reasonably hardy if protected properly as far as col de dama gris, Herman has it planted in ground in New Jersery so I would imagine that it is reasonably hardy with proper protection as well.
I had a strain of doree, not the same as Baud's it was decently hardy, suffered minimal dieback in a normal winter, but this particular doree is not the one most people talk about and had bad taste. Noire de Caromb I am still waiting for sprouts, it's not dead but it's not growing currently either, it also has a large ant colony living in it's pot though.