Summary: Make no mistake, these are high quality headphones. Their key strengths are a big, wide soundstage, a silky, airy presentation of female vocals, genuinely deep, extended lower bass and excellent detail across the frequency range. Also supremely comfortable!
Summary: The DT880s are the most neutral-sounding headphone I have ever heard, and because of this, I hated them at first. It took me quite a long while to become accustomed to their sound. When I did, however, it was a truly rewarding experience.
Summary: A great all-arounder. The build quality, and comfort of the DT880 is excellent. Sonically they are a bit above average. They are similar in sound to the HD650. However they seem to have a slightly leaner midrange.
Summary: First, the bad. The build is merely adequate, given the price, and the coiled cable is one of the worst design decisions ever. The mids aren't as sweet as they could be. I suppose that's why people call this a "neutral" headphone.
Summary: Very nice all-around headphone. Does everything well. The standout for me was the tight, fast, detailed bass, some of the best I've heard. I won't go on about all the good qualities of these cans, others have already pointed them out. I had 2 minor complaints and 1 major problem with these.
Summary: Coming from the Sennheiser HD580 (I've also owned HD600 for over a year) the DT-880 are a solid upgrade, in my opinion. Significantly more detailed than the Senns, yet not so detailed as to detract from the music.
Summary: These are some very nice headphones. The sound signature is very reminiscent of the HD580/600. However, when compared directly to the HD580, the DT880 has more bass extension, as well as more extended and present highs. The mids are also more detailed and realistic, as well as a tad sweeter overall.
Summary: I have the Cardas recabled version which provides more of everything that everyone else has described. The sound is so detailed. Those instruments that were hidden behind others in the past are now there showing why they were arranged to be behind the primary sound.