I feel like I must be going crazy, but I swear my M1's sound worse with the Remote wire than the Plain wire.
First impressions is that they do the A900x creamy mids except don't colour the headphones as much so they can be used with more genres. Though technically its bass is supposedly "loose", it easily beats the A900x here, but loses in treble, mids, and definitely in soundstage. There is definitely some glare/distortion in the treble. In presentation it handily beats the A900x for most genres.
Very happy with my purchase as its bass is very malleable with EQ, its treble/mids not so much, as raising its recessed portion brings more to light the distortion in the treble, but its still passable.