Pros: Comfort, looks, non fatiguing
Cons: Value, overall audio quality,
Let me begin by saying there is nothing special about these headphones. My first impression of them made me smile because I fell in love with the oral shaped ear cups (I'm a sucker for "small" full ear headphones). Comfort is a highlight that sennheiser did not lose when they made these headphones. But when your paying $1000 dollars on headphones comfort shouldn't sway you from giving up large gapes of audio quality. Which leads me to audio quality, if the only headphone drivers that existed were still dynamic drivers then this would have a great success for sennheiser. (Note I burned them in 6 hrs a day until roughly 250hrs) The best way to describe these headphones would be to call them average(neutral a good thing for studio) with plenty of warmth and a bit of harsh treble (not good for studio). A big con is the pain it can create in your ears if you listen to songs with lots of T's and S's. Some characterizes of headphones in the 300-500 dollar beat these headphones. And stiff competition such as the Audeze Lcd 2 and even hifiman he500 (that are hundreds less) make these headphones a rip off to some extent if your in the market of hifi headphones that are in the warm side.