Also make useful guard-dogs!
Cons - they are annoying. If they think you should be outside doing something they peck on the door until you come out. If you leave the door open, they will stand on the doorstep and honk at you. They poop on the step. If you are female and dare try to pee outside, well, I won't go into that. Just be careful. They follow you to the outhouse to supervise. If you are ill for a few days and then dare to get better and go outside again, they honk at you incessantly until you get back into the kitchen where you belong. They bite your butt when you are trying to work. Plus, you need a big pot to put them in when they do get too annoying to deal with...
We love them really, honest!