First winter with my new flock which included the Isbars. I am so impressed. The hens never stopped laying and carried the load when the others shut down over winter. I have never used heat or light and just let them rest according to nature. I would say the Isbar equals the Leghorn in consistency. The roosters, too, are so friendly and sweet natured. I think they will be keepers in my flock. BTW, I have a gorgeous blue Isbar rooster that I hatched last September, if anyone in this area is interested.