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I thought it was 1000 miles for non-"real" M cars and 1200 for "real" M cars. Although it's a fine point.
Re the easy vs hard break-in, I remember reading in Road and Track years ago that if you use an engine hard when new it will eventually wear out faster in the long run. But I have an airplane and those engines are broken in by running at full throttle for the first 10 hrs. With those, the teaching is the rings won't seat and you'll have to redo the cylinders if you run it lightly at first. I'm not sure what to make of these opposite recommendations.
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