Dana,
I haven’t heard the M3s but from what I’ve read they are not as good a timbre match to the M80, M60, M22, M2 family. Sean should be bringing his M3s over next time he visits so we can to an A/B comparison.

Dean

3M80 2M22 6QS8 2M2 1EP500 Sony BDP-S590 Panny-7000 Onkyo-3007 Carada-134 Xbox Buttkicker AS-EQ1