I have columbian wyandottes from a breeder...the hens have never been agressive and are super sweet birds (and great layers)...we also had several roos (mix up in sexing on the breeders part) and they were the SWEETEST roos in world! Roosted on our arms and talked to us! I think it really depends on the breeding! If you are looking to get hatchery stock, sounds like it's a huge unknown!