well, I love it.
When you register, it is a 'required' field in your profile, so the newbies will actually put stuff in it. Of course its not required, but also, now i dont have to put that stff in the siggy, so I like it. I think the default should be having it on, and if someone doesn't like it, they can change it. That way, the newbies know to put their stuff in b/c they see it at the bottom when in default settings.