I've been shooting Minolta for a long time, with no significant problems. My 8000i did finally need some work after 13 years of use! Minolta glass is superb, arguably the closest you can get to Leica quality without spending multiple kilobucks (in fact Leica have sold a couple Minolta lenses as Leicas, notably the 70-210/4). I don't know, however, how well all this will translate to the A2. If you were to join the Minolta mailing list on yahoo groups (just search for Minolta, it should be the first result - that is pretty much the main forum for Minolta users around the world), there are one or two people who have bought the A2 already. One guy was saying that there were a few things he had noticed: a) focus speed was lightning fast b)noise performance seemed to be better than Sony f808 c) images seemed to have a more 3D quality than his previous Dimage 7 d) construction was more solid than the Dimage 7. Also, Michael is about to finish his review here so if I were you I would wait to see what he has to say as well.
HTH
Jason