these are new and still haven't reached the 100hr mark. more like 30hrs. at this point i'm not sure that i like them very much but am hoping they'll settle down and smooth out the highs with more burn-in. i can certainly see/hear the attraction, in particular with rock music, but having been a senn guy most of my life i am having some trouble adjusting to the sound. it takes me a song or two to get in the groove but in the end the harsh highs are very fatiguing after an hour or so. by comparison, switching to my HD600's after that feels like I've crawled back into the womb. perhaps i'll try waving some dead chickens over them and if they settle down ;) any tips/advise would be very welcome.
make sure that you are wearing them so they sit flat on your ears, I find that if they are turned*wearing them to forward on my head* they tend to sound harsh*