DomiranI had the same happen to the original sennheiser cable that came with my hd800. I don't know whether these will hold up better seeing as i'm still waiting for mine to arrive, but I would point out that replacing the stock cable will be nearly twice as expensive as getting this cable, so independently you'll be better if you don't go with the stock cable.
kapampanganGamerNo sign of any wear after 4-5 hours of daily use over the last 4 months. I'm pretty confident the cable will last for a few years. Your mileage may vary though.