These were the first pair of over-ear Sennheiser headphones I purchased, and I had no idea how much detail I had previously been missing in the high and mid range. I also had no idea how comfortable a pair of headphones could actually be. I've owned them for over four years now and haven't experienced any quality issues. The headband and all aesthetic aspects of the headphone look as good as new, and the sound quality is as fantastic as ever. I found the bass of these headphones to be accurate and sufficient without sacrificing balance and detail...