I love the Koss brand, I've bought a lot of products from them, but these headphones really let me down. One thing is that it keeps losing signal. When I'm sitting quietly on the bus, when I'm going for a walk and I have my phone in my jacket, maybe every three songs the sound starts to cut off unpleasantly and the enjoyment of the music is completely lost. The second thing is that I can't wear them for a long time, because after about an hour they start to press on me. Also, when I'm walking with my headphones on, there's something annoyingly rattling in them (it's like someone tapping them). But the sound quality is good.