Finally got myself a pair of these. The question I ask myself is where is the infamous veil? The answer there isn't one. I am a long term Beyerdynamic fan but these sound perfect to me. I've always wanted a pair of HD6X0 headphones as they are classics like my HD25s but have been a bit wary of them thinking they may be over warm for me. Still thin the 650 might be. I made the right decision with the HD600 I'm sure.
These I am relieved to say have lovely treble and sense of air just dialled down a tiny fraction. The unforced natural sound and tone reminds of the DT150 in the Beyer range. However these are open and sound it which is what I need. Very pleased and won't be looking to buy anything else in the future
EDIT I was also a little worried about the comfort as I don't get on with many overear headphones(beyerdynamic excepted) preferring on ears but there are absolutely fine. No excessive pressure below the ear. Looking forward to many hours of listening