Ian is pretty much spot on
My official stance is that it's beta software. With any beta software you never know if you're going to run into something unexpected, so for the sake of safety I'll always recommend that beta software not be used in a live environment. The main reason is we can't guarantee that there isn't some major problem that hasn't been caught yet and we don't want anyone to put their live forum in jeopardy.
There are those that like to live on the edge and don't mind fumbling around with the code and fixing problems if necessary and are already running it on their live site
