InterfaceThe new interface will be the first thing you notice.
It remains a cross between Office of old and the Windows version of Office, providing a ribbon experience in addition to traditional menus.
Note that above I've used the built-in preferences to use the traditional color scheme, otherwise the ribbon/menu area would be the same blue color found in the iOS versions of Office.
It's buggy. Using Word with documents containing lots of annotations and track changes is an exercise in frustration, with parts of the screen going blank, inability to figure out which comments connect to which text, etc. Office 2011 was quite buggy for a year after introduction, and it's looking like I will have to keep two versions of Office in my toolbox once again for quite awhile.