Re: bbpress 1.0 integrates well now
I don’t think there is any overriding reason to upgrade Mike. Your access to bbpress is through bp. I doubt you’ll see any benefit at the moment. Unless Andy creates some bp features that require running 1.0 or wpmu develops some kind of requirement, there wouldn’t seem to be any benefit for the risk involved. (Read possible headaches).
Run what works for you, be happy.