This is the Sennheiser, it's good material, there is nothing to say.
Sound (this is important):
It's very good ... but I stay on my end regarding transparency in the whole area medium. To believe that fashion has gone in recent years to produce only instruments that make serious, serious .. the serious, to the detriment of the rest. For sure the seat and the serious exploration are excellent: control, extension, articulation is very good! when in addition we know that a headphone is closed! Fortunately it does not clog the medium by swelling abusive. but it is as if you had tied the headphone with 2 to 3 dB over flat to 80Hz and then after. One might think that the acute or upper midrange are not enough now! but it should be! they are just 2 to 3 dB below although linear, no frills. No audible distortion to a level where I work (I preserve my heritage auditory). The HD 25 II seemed much more balanced even if it produces less severe and is certainly less comfortable!
Otherwise perfect: very comfortable, well finished, an extra cover, an impedance or too low or too high = it works well on any device (though it works much better with a source capable of delivering a small current) .
In summary, the DJ will be delighted. AC hits bottom. The Monitoring Seems a bit difficult for me but it's personal. To get the real tone of the instrument registered, I still prefer my 325i GRADO ... But tastes and colors!
Excellent value for money in absolute. it's just a matter of response needed.
As usual! Do not buy without listening!