I was as a HiFi meet earlier this week, and found they to be the most comfortable pair of headphones there. They are great for long listens and has a decent sound stage. Thou they do lack the bass which can be a good thing or a bad think depending on user.
I personally like them better then the Senn-555 that I tried.
Oh I think the pair I tried had custom valour ear pads,too. XD