I had a couple o' pairs (hd75's and hd200's) and both ****ed up within 6 months, one of the hd75's within 3 weeks. Not doing anything crazy with them, just mixing in a cold garage.
Sennheiser then said it wasn't their fault, so now left with 4 headphones that are useless. They might be good quality, but ripping you off on cost to begin with and then further f**king-you-in-the-ass when you need help has destroyed any reputation I had of them.
Nice pair of Sony's now though, beleive their called "silver pieces of shit"?