I must say, in nutshell, it would be its BIG bass when needed, e.g. in genres like electronic/drum and bass; excellent, neutral mids, where vocals reside; highly extended high frequency response that gives the DT 150's sound a gloss of clarity, but remains non-abusive by eschewing any undue harshness; a very big, and particularly airy soundstage, one so well done that its quality cannot be reconciled with the fact that these are CLOSED headphones; great isolation from outside noise; very tough build quality, which, of course, is by and large idiosyncratically Beyerdynamic; and lastly, excellent comfort

As closed cans, I find the DT 150's leakage kind of poor, but isolation from outside noise is excellent, as I cannot hear the whir of my computer's fans as I listen to music