Beautiful, intelligent dogs. I never liked the scruffy look of them but after getting to know a couple and learning about their temperament, I've grown to love their looks as well. The ones I was very close to (one has since passed on, one is 4 years old) were very protective, but not overreactive. They were obedient but also quite independent and strong willed. The male I knew was very dominant with strangers, he did a lot of posturing at first when someone new came into the house. He tolerated other, submissive dogs but not dominant males. The female I know is more submissive and agreeable than the male was.
I'd love to have one someday.