Glad to see a few folks drop in. I do not breed them and currently only have one girl but I do enjoy the breed. As far as roo behaviors, I think that attack roos are common. The ones we had were bi-polar. If you turned your back they would jump you but if you sat down near the flock, they would jump in your lap and wait to be petted.
Dr. Bramwell also said that his roos always ran on the more aggressive side when I had discussed it with him.