Summary: First off, don't get me wrong. These headphones are great. They are Sennheiser, they have high worksmanship, they're comfortable, and they block out some noise. The DJ feature is nice, but most people who wear these probably don't use the feature often. So why, in my opinion, are these headphones so bad? The sound. It was weak, paltry, and produced only the most fundamental bass.
Summary: I ordered the HD215 for DJing on a vinyl mixing console but was disappointed with the lack of bass response and overall bulkiness, though I was willing to let the latter pass for a good pair of DJ headphones. Am a beginner trying to master the fundamentals of beatmatching and need my beat ala bass...Am going for something else.
Summary: I guess Sennheiser assumed that only DJs would use these phones, in bass-heavy dance club environments, because they completely neglected the low-end response from the phones themselves. The mid-range (vocals, etc) sounds excellent, the highs are a tad bright, and the bass response is non-existent. If you listen to rock, dance, hip-hop (basically, any type of music with pronounced bass), you will hate these phones. On the plus side, I guess they are comfortable.
Summary: These headphones are definitely overrated. Sound quality was nothing special, especially considering the price. They are also very uncomfortable. There are too many good reviews here, don't fall for the trap like I did.
Summary: As a background, I own a pair of sennheiser px100 and Koss portapro for the last couple of years and was looking for an upgrade. I must admit that having seen the reviews, I was convinced that this would be a good upgrade. Unfortunately, I was wrong. Dont get me wrong. These have very good clarity, but very poor on bass. I will not say that bass does not exist, but it is not inline with my expectations. px100 & PortaPro are easily way better in bass.
Summary: Habe den Kopfhörer bestellt da ich dachte eine günstige Alternative zum bewährten HD25 zu erhalten der ja nicht unter 180€ zu bekommen ist... Der Kopfhörer ist jedoch nur für homelistening Zwecke geeignet! Bei erhöhter Lautstärke (normal beim Einsatz im Club) fängt der Kopfhörer sofort an zu knacksen und zu übersteuern... ausserdem ist er tatsächlich im Bassbereich etwas schach auf der Brust! Fazit: Dj's Finger weg!