when I first bought these headphones I must admit the sound quality was incredible, and with interchangeable buds they were also very comfortable. However 4 months down the line and 1 of them no longer works. Thinking it may be a faulty pair I bought another set and, low and behold, found the same problem occurred. I'm pretty sure my usage wasn't what you'd call strenuous; 40 minutes a day, 4 days a week while I walked to work and they were never left to get tangled with keys or anything else in my pocket.
All in all, they're fine if you just want something that looks nice but won't last long. If you're looking to invest in headphones that will keep going, I'd steer clear of these.