I have owned these headphones for little over a year now, and they are definitely worthy of the Sennheiser name. They offer accurate sound reproduction, which is a necessity for an audiophile, like myself. I have noticed that they do sound better when plugged up to a computer vs a phone, this is due to the 54 ohm impedance. They don't sound bad at all in mobile devices, but there is a boost in sound while using computers. They may not be the coolest looking headphones out there, but the reason I buy headphones is to listen to music, not as a fashion accessory. These are labeled as studio headphones by Sennheiser, but they sure do perform the task of everyday music listening. The only problem that I have is the case, nothing bad about the headphones :D The headphones just aren't super snug in the case, and that is perfectly fine. This is a very minor thing, so I wouldn't base your purchase off of this. Overall amazing headphones. Although these have been discontinued on Crutchfield, you can still get them on Sennheiser's website. I definitely recommend these to any one who is passionate about music.
Pros: Sound Quality, Build Quality
Cons: Carrying Case