The MX-500 is probably the best thing you can have in this size at the moment for his money. The sound is crystal clear, it tends to no distortion. Playback is very differentiated and spatially. I have (ie the successor) can test and a 50 euro expensive model of Sony two days ago this model to the MX-550. The MX-550 completely swallowed the heights, looks overall very dull and lets too much through the middle. The Sony seemed very diffuse in the high-frequency reproduction. Those who could not find: the foam pads have the purpose to make it sound the bass properly. Behind this are relatively simple physical laws that can not so easily overcome other models. The MX-500 is relatively thin, and must prevent the air circulation so. In this respect, the statements "no bass" due to an inadequate trial and error. Conclusion: Stay away from the followers. There is virtually no better earphones for the price, and it will hopefully give a while.