Spent much time reading here, now some words in return: thanks (mostly) to this forum, I had an open gestalt that didn't allow me to settle down and enjoy the M3, knowing that
AONIC 50 exists, which sounds even better (for actually smaller price - here in DE I could find A50 for ~200 Euros) - Yeah-yeah, many wrote here they are both great headphones, but somehow only few preferred M3 after hearing A50. Finally, I have got my hands on A50 and compared them to M3. And, damn, they couldn't be more different! I was expecting to get something more balanced with more clarity and less pronounced bass than M3, but A50 turned out to be too much the opposite of M3. I really thought that "analytical" sound can suit me better, but I was wrong (?). It took me only an hour maybe that I knew I _definitely_ stay with M3. I listen to mostly electronic music now (idm, dub techno, leftfield, house, uk bass, breakbeat and blah blah), but also like jazz and progressive rock.
Sound: Before M3 I had Sony wh-1000xm2, and transition was justified - even though my wife didn't hear much of a difference, M3 was a next level for me. Better soundstage, separation of instruments, a lot of bass, yes (but it can be reduced in EQ on the phone and saved then - though EQ could be still better..), yet without ruining enjoyment from mids and highs (contrary to XM2). Still, it is safe to say that M3 and XM2 sound at least more or less similar. (At least compared to A50 hehe) And how about A50? In one word, I would describe their sound as intrusive (all is subjective
). (not flat, or boring) Too much clairity, and even though more bass than I expected, still in some tracks I missed it - Overmono "iii's Front" is a good example, hell of a track, it has quickly passing "biting" bass sounds that were nearly missing with A50, how is that? Is this an analytical sound? So I thought let's play some jazz and put on nicely recorded Matthew Halsall album and you know what - M3 easily won for me again. You can take it as a joke: A50 sound like if Shure engineers did all analysis for you
while I find M3 more inviting to explore textures and layers - simply put, M3 are just more musical for my taste
Comfort: here I expected less from A50, but got more, though I cannot say how does they feel after hours of listening. Also, still struggling with the headband of M3 - already made an additional cushion there, but still hurts! I think, pressure should be better distributed to the sides (and less to the top) to eliminate that.
ANC: don't care, listen at home.
Conclusion (you guess it): AONIC 50 and Momentum 3 are very different beasts, listen and judge for yourself