Thanks for that Digitalversus link. At least it's something. Same driver too as the L1. Neutral, so they say.
Sounds really interesting.
I have to admit I returned them to Amazon after a short listening session: too recessed highs for my taste, a bit bloated bass and too hot on my ears for prolonged office use -- overall a disappointment to me. Anybody looking for a fun amount of bass might like the sound signature though.
I do still own the L1, which shares some of these faults but has better build quality overall (cups are metal, not plastic, headband has better cushion etc.), still too dark but avoids the midbass hump I had with the M1 a bit better. Nevertheless I'm going to sell them as soon as the next pair of my small collection drops down to 'office use' ;-)
I tried them today. My ears tend to hurt easily with on ear, but the comfort on these ones was really good. I think the sound was alright but perhaps a bit too much bass for me, especially in this price range. I don't like the thought about turning down the bass or increasing the treble for something more expensive than Koss Porta Pro.
I bought them today with a 50% discount. However, I am still a little disappointed. As with the L1, comfort is amazing. Build quality is not on the same level, but still good.
Sound, though, is a different story.
It's not just warm and bassy, but there's really missing some highs at the top end. Bass bleeds and timbre is really not so good. Resolution is poor.
For us head-fiers the M1 should not be interesting. The HD25-II easily owns the Fidelio M1!
I think masses will be better off with the M1 instead of Beats Solo or Bose on-ear, but sadly the M1 belongs into the same category.