I have try many earbud and the mx400 be hands-down the best value for the money . the sound be crisp and well-balanced . they be also highly efficient so that they produce enough volume for noisy environment like airplane . what I especially love about these earbud be the way they reproduce bass . I be a bass player and I love the detail that these earbud show in the bass . with the mx400 I can listen to a song and immediately recognize `` he be play a Fender jazz use a heavy pick on flatwound string . '' they be that good . but that might not be for you . there be a lot of people who do not care about such thing and instead prefer exaggerated , underdamped bass . if that be you then skip the mx400 . to each he -lrb- she -rrb- own . as with any bud of this type the frequency response will vary depend on how tightly the driver couple with you ear canal . this depend on how far you press the bud into you ear , and what you ear be shape like . yes , there be better earbud out there , but for less than the cost of a medium pizza these be great .