I've driven a few people's E9X M3's because they thought they had transmission issues, turns out one or two of them weren't shifting very well, the rest of them were just being paranoid. I think if you have straight issues, you'd know.
If only you were out in SoCal.
As an aside, my 2011.5 M3 occasionally grinds during cold starts, but otherwise shifts baby butt smooth. Been beating the crap out of it at the track, and it felt pretty nice after two or so track days.