From watching the demo and reading a little bit it seems that MM allows you to access your files from .. The Web, the Finder via a mounted disk and also from Windows via a mounted share of some kind.
Is that correct? It seems like the perfect solution? Too good to be true?
Do other online storage solutions offer all that? What about MS Sharepoint? It doesn't seem to. Google docs doesn't afaik.
That alone would make me pay $100 a year for MM.