been using win pro 8.1 on my surface pro 2 without a hiccup unless you consider using the capacitance pen an issue since AC not written for touch screen/gesture technology and some of the tabs are small; would like to be able to expand the view and only use my fingers.
Use the metro interface, removed those tiles I never use and replaced them with tiles for AC, quest, hospital information systems and once chosen they get brought up on the desktop anyway, haven't had problems with latest Internet Explorer in past got around it by using compatibility mode when a website connection issue came up.
just my 2 cents