I have one. It sucks. Period.
If someone crouches, it still aims where their head would be.
Also, I just don't use it, because its aim is horrible.
Actually, I do use it when I'm AFK. I make the hug motion and my character stares at people. :3
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EDIT: Also, It just sucks. I know I said it already, but it really doesn't work at all.
I prefer my hands, thank you very much.