These are the best in-ear headphones I've ever held in my hand, and I have a lot of models from Sony Panasonic, etc. But the MX-500 has not yet been surpassed. At the sound, there is nothing to complain about. Good bass and clear treble. The only drawback is the connector: It is too loose and if you turn it goes at a certain point the quality lost. This happens only when provoked it, but costs still deliver a star. Otherwise, I highly recommend this product. I do not think that there is a comparably good product on the market for the price.