1st of all these are the loudest headphones I've ever put on my head. I don't know if I'm saying this right, but it's a pounding loud. They bang your eardrums relentlessly and you can feel it; I got ear fatigue within two minutes. They're a very tight, secure fit and that coupled with very hard earpads it was a very painful experience also. I wouldn't recommend these for extended listening on flights or traveling. Not a comfortable experience at all. But, for DJ'ing, I would probably put these up against anything else out there. You get a lot of versatility with the aforementioned volume, plus they sound a lot sweeter than other DJ headphones. That is, if you listen with both ears. These headphones seem bump up the lows and low mids from about 60 hz to 200, right where you get the clarity of your kick drum, and roll back anything under 60 hz, where your sub bass is, which incidentally you don't want to hear in your mixing headphones anyway. The foot comes through very clear in a DJ set, and in the midst of a loud sound system set, I was extremely impressed by the clarity.The mids where your backbeat/snare/handclaps are is also very clear, "prominent" or "pronounced" I want to say, though I wouldn't say *bumped up* like the foot and sonically, these have the potential to be the best ever DJ headphones.
As with all Beats, the soundstage seems to shrink if you're not listening at full volume. Not going to comment on the "sheen" or "sparkle" on the high end that the rest of the Beats line has until I've broken them in a little bit more, but I was distracted by an overall harshness or beating. These things hit hard. And no batteries! They're even louder than the Studio Beats but they're definitely not a Studio Beats replacement because they don't sound anywhere near as sweet and they're a much less comfortable for extended listening because of the harder ear pads.
For professional mixing? Forget it. Absolutely out of the question. However, for singers they're sensational because they isolate the sound from the outside world pretty good. Puts the vocal right up close and intimate like Luther Vandross.
So in conclusion, I'd say these headphones are for a very specific purpose; spinning, and for that purpose they are probably the best ever. Seriously, sonically they seem to be engineered perfectly for the party. For iPad/iPod/portable music listening? Even though that's listed on the box as what they're "made for", I'd have to give it a pass.