As far as I know they should be as good as most any other. They were derived in part from Leghorns and have and the body type/combs that should do well. Mine are just six weeks old and the weather here is warm, but not extreme. They seem to be thriving since going outside a few days ago though. They also are supposed to lay well in winter.
ETA I see you are in NC. I'm in the SW part of VA so maybe our climates aren't so different.
Thank you.
I like a few white eggs among the brown so maybe I'll try them.