Only played 2 CDs so far.
First was Mozart. First impression during the first few seconds was a hump in the mids, probably caused by the phones being closed (Up till now I only had open designs), but my ears adjusted quickly to it.
The second was a Jazz singer (forgot who it was) and it did sound very nice.
Warm and full sound, great isolation to the outside means I can keep the volume down (and ears save) while listening to my music.
I believe the person before me used them 30 hours or less. They may need some more time to break in.