Received international version yesterday for $600 from amazon.
Initial impressions are bellow.
My current headphones are Custom Studio (modded DT 770) from e10k with bass boost, and EQ-ed 1000xm3.
Build: looks fancy and impressive comparing to plasticky Custom Studio and 1000XM3.
Comfort: feels heavier than my other headphones. Earcaps comfort is good but they may be warmer comparing to valuer. I feel some pressure from headband comparing to nimble Custom Studio.
Sound: initially I was disappointed because of much less airness comparing to Custom Studio and 1000xm3 sound, but as time goes I see appeal in smooth, thick, batter-like sound and started enjoying it.
Also EQing mids helps to make vocals more prominent, because they sound recessed in some songs.
I bought this to use in office for prolonged hours of listening, because Custom Studio are too harsh and fatiguing at times.