It has a similar feature to the Sony where if you scroll on the very right it uses the letters of the alphabet to scroll through. And you can make playlists on the M0 but I don’t know the song limit for each playlist, but someone does
Also after using the A45 for a while and it has burned in some I do think it sounds better than the M0. Both sound good, but the stage and treble opened up on the A45 and the bass tightened up. There is more space around the instruments on the A45. Funny because it sounded quite different out of the box.
M0 has a bit more power though.