I shoot video mode with the M. In fact I shot some tests with the idea that I'd do my "real" shooting with a higher end camera but the EOS M performed so well that I'm using it for a documentary I'm doing.
I'm not shooting raw, increasing the H.264 bit rate or anything like that. My settings are the standard 1080p 23.976fps. The ML features that I use the most are the audio metering, focus peaking and 3x crop mode. The crop mode is particularly interesting because I mostly use prime lenses and it is like having two lenses without having to change lenses. It doesn't seem to reduce the resolution and people report that moire and aliasing artifacts are greatly reduced or eliminated though I haven't had problems with this because of my subject matter and I always shoot with a flat profile.
By the way, the most important setting seems to be the profile. I use Technicolor Cinestyle because that's what I started my project with but there are several others. The best advice I can give is to test, test, test and then shoot a lot.
The EOS M is a fun camera for video. You can set it up to look like a point and shoot camera to go stealth or attach cine lenses on it and it looks like you're using a director's viewfinder. Of course you can also put it on a shoulder rig or strap it on a drone.
