You can never go wrong with these, tbh. Specially the Sennheisers. I haven't checked the AudezeMM100 reviews yet so I can't comment on them. Just make sure you audition them first just to make sure they fit your taste

Unfortunately testing them isn't really possible for me, so I'm mostly going off waht I've read online. As t the moment in pretty much set on getting the Beyers, because I've read that they have a better soundstage and I like treble.

The MM100s by audeze, as far as I know, are set to start shipping this month, if they're any good, I'll consider getting them if I'm able to, but, again, I'll most likely go with the Beyers since I've dreamed about having them since I was in my first year of highlschool.

Definitely valid concern. I have 3 hifimans and I'm lucky they don't have issues yet. But I've seen a lot of people having issues with theirs. I hope Hifiman fixes their QC.

Honestly, I'd buy a HiFiMan if I lived in either europe or the USA, but since I live in Brasil and I, most of the times anyways, buy my headphones through AliExpress, buying anything HiFiMan is a huge gamble since I can't RMA them easily.

Don't worry about the K240 - I haven't met anyone who likes them lmao.

At least you like it, I think... Unless you're some kind of masochist - and maybe you are given that you also spend, what I assume is, a lot of money on headphones, dacs and amps for the definitely real difference in sound that isn't in our minds and totally justifies the amount of money we've sunk into this hobby.