I got to play with the M this past weekend at BH. Its garbage. Canon really f'ed this one up. I cant fathom why they would ship something like this.

The AF is possibly worse than you imagined...seriously. Prepare to be disappointed. It takes a LONG time to focus. It tried it with the 22 f/2. I wanted to check that out and the much reviled 5dm2's outer focus points, and yup, the reviews are truthful on both matters. What a shame, I wanted to see if it made a good travel camera.

Beyond that, the body itself is far from ergonomic, with the thumb grip woefully small so much that it wouldn't matter if it wasnt there. Also tinkered with a t4i (there were all next to each other) and the focus on that lil rebel is ACES.

Go try it for yourself though.