I've downvoted once or twice when it was spam. I've upvoted many excellent discussions, a few of which I even disagreed with. When I disagree, I reply. Always,

I've downvoted once or twice when it was spam. I've upvoted many excellent discussions, a few of which I even disagreed with. When I disagree, I reply. Always, I learn something new, regardless if I changed my mind or not.