The only issue I struggled with was the fact, Joo!BB requires PHP 5.x to be active on your domain. Mine was still running at 4.4x, so I had a couple of parse issues and other errors after installing.
However, once I managed to switch on PHP 5.0, everything was running perfect. The Support forum, naming especially "Robbie", was a great help to sort out the initial issues and to start up.
I will now follow this forum over the coming beta and to the final release. I know, this is exactly what I was looking for. if somebody wants to see my Joo!BB test forum, go to www.scifi-world.de
Some minor issues may be still present on this early release, however, I'm convinved Joo!BB is going to be a major component for J 1.5x users, locking forward.