The headphones shipped today, and after a few hours of listening, I can say that these headphones are simply amazing. A few minutes into listening, I realized that they sound best with absolutely no equalizing. They're great with any genre, I've listened to rock, D&B, Psychill, Goa-Psy, classical, and so far it handles them all perfectly. If you are thinking of getting them for mobile use, only do so if you plan on getting a portable headphone amp, maybe the Fiio e5 or e6. I listened on my ipod for a few minutes, and it sounded... strange. Most of the sound was still there, but the 20-40 hz range was missing, and it sounded kind of tinny. Ipods just cant power high-impediance headphones like these (64 ohm). As for the build quality, most of it is built of rigid plastic, but the joints are made of a flexible metal (my guess is a high grade aluminum). They feel a lot more sturdy than my old JVC's, which broke because of the swivel joints. The headband is leather or pleather on top, and padding on the bottom. The cords are nice and thick, and go into their joints in the headphones with a good click. Unfortunately I can't keep listening, I have stuff to do, and its time to let them burn in.