Just used them in the studio for the first time yesterday.
1) isolation is outstanding (this was one of the key reasons I was looking at these cans).
2) great fit, at least for me, both over the ear and clamp.
3) that the cable can be inserted into either cup is a nice feature.
as for sound quality: well, my segment on Tulsa's Mix 96 (What's Your Problem Wednesday) is mostly talk, as is my show on KRMG (What's Your Problem Weekend) so... I sounded GREAT! So did Tad and Kendall. But, due to the nature of the show, there isn't much time for me to enjoy listening to music while everything is going on.
These do everything I hoped they would. And, they look great. Immediate headphone-envy from Tad, who is a long-time Sennheiser fan. If anything, they're overkill for my purposes.
But, sometimes overkill is just what you need. :)
you mean the hd 8 dj?