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My (ex) wife is a diagnosed psychoath. I was aware of her condition, we still married, but oh Lord did that bite me up the arse later... I'm glad she eventually broke up with me, because now I'm in a happy and healthy marriage with someone who actually cares about my feelings, who genuinely loves me and is a delight to be with 24/7.
It's a draw. Awesome animals, but would not recommend them as pets.