Maybe for you, and that's great... But for many, it's way too limiting: no tuner display, doesn't track IA states from the preset, etc.The MFC works great with my III. I think it will be even better because the only things that are missing for me are automatic preset name display (which I don't miss at all due to all the name time out issues I was having) & the tuner display on the MFC which you won't need because all of that will display on the FM3.
The FCs are so much better with the III.
But of course, it's totally dependent on how you work.