Orga recently complained that you have to manually refresh the page to see responses in the Cbox, or refresh the box its self. And that it's inconvenient. SMF has many shoutboxes. But people seemed to like the Cbox, much more compact looking. But either way, members choice.
If we do go with Shoutbox, here's what SMF has to offer. I personally like the nneonneo's one. As I've seen examples of it on other forums, and it works real well.
http://custom.simplemachines.org/mods/index.php?action=search;basic_search=Shoutbox
