This really knocks the stuffing out of everything else that I have seen! Real OO-PHP and superb Joomla integration. As others have already noted, it does so much while - so they say - ignoring or replacing other extensions, that it may not be the right choice for everyone, but if you just want a Joomla site with the CMS side of Joomla for more stable content and to also have a community and forums for more user interaction then this is it - and the Captcha integration in the JooBB registration solves the problem of the lack of aforesaid in standard Joomla.
0.9.0 still has some PHP errors in it, but I'm sure the developer will soon have those sorted out. So many thanks to Robert for a great product!