I played with the M yesterday since I'm leaving for northern NM this weekend and will use it in the mountains and off road. I found that if you don't rev up the engine a bit, it has difficulty shifting up. Have to press the button several times. If the engine begins to lug, it will automatically downshift. Shifts are slow and sloppy, but are the same way in normal mode. Something Ford needs to fix. Don't try to use the tiny tops of the paddles to shift, just press the bottom of the toggle switch on the back of the steering wheel.
I watched a BS review awhile back and it talked about how all brand vehicles similar to the BS 2.0 L have almost no difference between 2nd and 3rd. Tested that at a constant speed and rpms only change a couple of hundred.
Side note, my son attended the Porsche driving school in CA yesterday. Sent me a video of him on the skid pad. Looked like fun.