1 year on my head, so far so good, just had a problem with the cable, but the pair itselfs still impresses me sometimes.
To the new owners, I recall the first time I had these on, was incredibly disappointed with them. They sounded distant, lacking a lot of precision and weren't tight at all in lows. Went on the net and read about people talking about burn-in time (like 30 to 50h) and said to myself: "these are headphones not 52cm subs What". Never believed in burn-in anyway. Was about to send them back when I said "well **** it, let's give it a go". At this time they ran during 2 days straight connected on my desktop.
Putting them back on was trully a different story. Everything came along great, tigher, faster, the imaging was utterly different.
And the quantity of bass these can produce when amped is just too crazy to fathom (it's like receiving little puches in the jaw !), not that it's a remarkable point for music listening, but for movies, it's quite something.