Flew in one last week. PAX wise, does what it says on the tin. Quiet in the cabin, ride was good, didn't feel too full with 6 on board. I didn't think the build quality was too bad - not much by way of squeaks or rattles in the cruise.
I'd want to fly in an M2 on the same day before making a decision as to which one I'd buy (completely ignoring the numbers & potential operational difficulties inherent with a new type from a new manufacturer).