First of all, amazing sound quality for the price. Get the earbud size right, push them in deep, and the sound quality is superb. I've owned various Sony's, CX300's, and these give the best bass response out of all of them. However, having tried all three ear buds, I constantly find them falling out as I walk. This happens very often, and I'd say I have to push them back in my ears every 5 mins. Shame, as otherwise these would be the best headphones I've owned.