Well.. I'm on the pro-cbox side.

It would be much easier to just check on the cbox for messages like "I've replied to your post," or "Everyone, I'm going to be a little inactive because..." than to have to check my PMs or create a thread stating it (in that order xD). And because the "view recent posts" option isn't available until I log in, that would still force me to log in and not just look at the forum for something new (unlike proboards, which lets guests see them, and therefore doesn't require logging in), so being lazy isn't a problem. xD I think this goes for everyone.
Besides, timed discussions never work when nobody's on at the same time, most of the time. xD
That's what I think anyway

EDIT: Besides, it's not like the chatroom is more useful. My dorm's internet can't even load it. XD