4 Good but not excellentpyriel800 | 04/01/2012 | See all pyriel800's reviews (1)These fit (my head) great and are really comfortable even after extended periods of listening. However...I bought a pair of 310's and in a straight audio comparison the 510's just aren't quite as clear and defined. The 310's are much brighter sounding.Additionally the 510's seem to have an audio balance problem - the left channel is slightly better than the right) which leads to a slight 'off centre' feel when listening. This may however, be a problem with my pair (and I'm considering getting them replaced).Range wise they cover everything from dubstep to classical with ease. I've put a wide range of music through a variety of devices (A/V amp, iPhone, iPad, PC) and they work very well - other than the previously mentioned niggles.They are a fine pair, and I will still recommend them (and at the price paid - 23.99 - who couldn't). Just I seem to prefer the clarity offered by the 310's.