I've not had the "pleasure" of trying Cumulus 6, but as a whole I despise the software. Overly nitpicky, overly complex, overly retro in its functionality, design and execution.
<unsolicited opinion>Unless you really need the WebPublisher component, I see no reason to use Cumulus over Portfolio (if you need network based) or iView (if you just need a personal image db).</unsolicited opinion>