first off lets start with construction.
the headband is the same as most ultrasones having owned a couple with the same headband and at one point throwing one pair on the ground i can say the headband is very tough. the earcups themselves however do feel somewhat cheep and im a little concerned with thier durablility. the cable seems fine although where the cable attaches to the earcups looks like it would be very easy to pull off. please note these are a semi open headohone there is very little isolation but definately more isolation than an open headphone
now lets talk about comfort.
the stock headphones come with some kind of imitation velour earpads (the headband is pleather) which can get itchy but its fine for the first week or so of listening. i replaced mine with the dt880 earpads and didnt notice any difference in sound from them. the clamping can be adjusted by loosening the screws in the headband. the headphones all together arent very heavy and dont get tiring untill a few hours.
now for the important part the sound.
ive burnt these headphones in for about 40 hours now and have concluded there pretty much burnt in.
highs: the highs can be a bit bright but not fatiguing. they are very crisp and stretch up very high but when you hear a sharp note its not ear shattering.
mids: while i think the highs were the focus of these headphones the mids are amazing clear detailed, and not recessed as far as i can tell.
bass: the bass on these headphones are very tight and will stretch very low without trailing off, though the bass can hit with the right songs most of the time the bass hits lightly and really only noticeable as a sound rather than a feeling of pressure like my ultrasones
soundstage: very good depending on the song i can feel like im in a crowded auditorium in the far back or right up front in an auditorium with myself and the artist.
other sound qualities: these headophones have amazing instrument separation, and so detailed (i know its cliche) that i can head things i wasnt able to with other headphones. the voices on these headphones are perfect you can hear every sound that the artist makes from swallowing to drawing a breath. lastly its important to note these headphones are slightly colored.
i have used these with my objective 2 using a fiio line out dock from my ipod classic and the only difference ive noticed in sound is that the highs get brighter and a slight hissing sound when the music is quiet
i would not hesitate to recomend these headphones to someone looking for a well isolating semi closed headphone.