Yep that was me, I got my 11 today and I agree with HBB, in fact out of the box the m11 sounded a bit better than the dx220 with both my akt8ieii and meze classics. I thought the stage and detail were on par but the m11 had a bit more energy and openness. And of course the UI is smoother and it doesn't get hot and it plays my wma files too.
So instead of sending it back and taking a $160 restocking fee hit I sold it to a fellow head fi member
I trusted my ears, I had my doubts but hey I'm glad I tried m11.
Enjoy dx220! it's a fantastic dsp.