I set up a 750 on my GF Mother's machine with XP and used the native drivers. In combination with the control panel on the unit, it does just about everything it's supposed to do. Even two sided printing.
At any rate, give MS and HP a month or so. They'll have drivers for it. They already have drivers for all their single function machines that work very well. HP and MS are just making sure the drivers for the MFs are good and stable before they release them.