The quality control is eh, but they have great customer service... If it's within warranty, they replace it for you after you cut the cords up and send them a picture. From my experience my Brainwavz IEMs last anywhere from < 12 months - 3 years. I don't put them in a case or anything though.
I've had horrible luck with their quality control I've received four sets of bad headphones from them so far including the drop. I can't recommend them to anyone at this point.