Pros: Good amount of detail and also great passive noise isolation.
Cons: They will not sound good unless you use high quality sources. Minor coloration.
This was recommended to me by a friend and because of the other great reviews on the web I purchased a pair. What I can say is that it really brings out the details in music. Those low bit rate MP3's will not sound too good now. Bass is not exaggerated and highs are nice and smooth. The quality of the DAC is very important for this set of cans. The distortion in the mids were largely mitigated with the use of a high quality source (Guess my Xonar U1 was not not as good as I thought). They are highly detailed with a small amount of coloration due to the closed design which can be expected.