The sonys are good for sound quality, the only issue ive noticed (like other people) is the poor build quality in their products. if your spending less than ?40 on headphones go for the Numark PHX's no question. Excellent build quality, ive had them for 2 years without any issues (Except when my mate snapped them whilst ****ing around) and awesome sound quality. I tested them against the sonys and they were as good, comfortable aswel.
