What do you think about quiet guys?

Except the fact that they are quiet.
I'm not talking about guys who just keep their mouth shut no matter what but the ones who are quite in general and don't talk too much. I am one of those but I do have my times when I open up with my friends and chatter. Most of the time, I only speak whenever necessary and I just don't open up with other people like some of my friends do. I think I can be friendly because that's why I have friends? From my experiences I can tell that I'm between selective and anti social (more inclined towards anti social though). But I do know how to get my work done if it includes any necessary communication.

What do you think about such guys?
What do you think about quiet guys?
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