If there is but one thing of which we can assure you, it's that the MeElectronics M9 earphones will blow your stock MP3 player earbuds out of the water in terms of sound quality. Not that that's much of a challenge. Still, the M9s provide impressive audio for the money. Lows tend to be a bit muddy at times, but there is plenty of oomph for the bass addicted among us. The mids are warm and encompassing, though not as smooth as what you would get from a pricier pair. The high-end comes in last, which means classical fans won't be impressed--but then if that's you, you should be spending a lot more than $20 on headphones. Highs here are at least not brittle or overly sharp, and there is noticeable detail representation. All in all, you're getting a great value with the M9 sound-isolating earphones.