Just got mine today. Out of the box and trying them on I must say these things are sooo freaking comfortable. It's a fleece-like material, something you'd expect on earmuffs. Problem is that it doesnt really breath well and it gets uncomfortably hot after long listening runs. Nice thing winter is coming up, hehe. Physically they look kinda something you'd pull out of the movie metropolis or something. The adjustable headband fits very well, but looks cheaply made with hard, durable materials and with folding/ripples on the bottom of the band where your head touches....crappy quality checking maybe? It's extremely light, made of mostly plastic and a metal grill.
Listening to them after my friend played with them out of the box for and hour, they sound very much like my cd3k's, but of course doesn't manage to bring out the resolution and detail as much. It also doesn't have the crazy large soundstage (or headstage, whatever you prefer to call it) as the 3k's. Reminds me of a Grado soundstage, with the vocals pushed back veryyy slightly. Bass is smooth and not boomy, but it not as detailed or prominent like the 3ks, tho im suspecting that burn in would help in this department alot. The sound's generally on the bright side, but not as harsh as the v6 as many have mentioned (to my ears at least). Separation of instruments and dynamics are handled well...but again, not as well as the cd3k's can. Comparing classical on the cd3k's and 780s, the 3k's sound clearly in a different league. Nevertheless, they're just as fun as the cd3k's at a fraction of the price, so why should I be complaining (or even comparing the two in the first place)? I like how the cable is detachable and that it uses a 1/8" mini plug on both ends of the cable, leaving room for potential cable upgrades that might help it out on the flaws....but upgrading a cable for this, you'd be spending more on the cable than the headphone more than likely, even if you DIY. The 780s are also MUUUUCH more forgiving on revealing your sources, whereas the cd3k's will blatantly tell you "hey buddy, your source blows..so i'm gonna play lotsa noise to piss you off." The 780s are also slighhtly harder to drive than the cd3k's on my EAR+.
Overall this headphone purchase was a steal for what you get....and no, I didn't get an extra cable...pooop.