I am with Ampa. I use the ribbon, and have since day one. Instead of forcing myself to use something old, I find myself pushing to new technologies and concepts and am often happy with the results. This has been the case with the ribbon. It helps me learn shortcuts to make myself more productive. I have learned many more shortcuts, exposed new features I never knew were there, and overall be far more useful when it comes to operating MS Office.
I have never once purchased a full-priced copy of Office and I probably never will. Many home users do not need to purchase it as it will either come pre-loaded on a system with a version that is good enough for them, or they will get it from work or their educational institution. My two copies of office 2010 ran me a total of 80 bucks (Professional edition).
Also like Ampa, I find myself unable to switch to other competitors products because they feel old, clunky and nowhere near as polished. The menu driven system, or desire to use it I should say, is gone for me. The ribbon, with it's auto-hide feature, is the wave of the future and I try and show everyone I meet just how useful it can be once you figure out what it can do.