I agree with another reviewer who commented that the treble is muddy-sounding. In fact, other than the over-emphasized bass, the overall sound is fairly muddy. As far as Koss' famous "lifetime warranty" is concerned, I obtained these through that program - when I sent in a pair of studio professional headphones which needed only foam earcushion replacement - and received back these [less expensive] portable-stereo headphones. When I contacted customer service, I was told they had already thrown away the ones I sent and had decided these were a fair substitution - if one ignores small issues like twice as high distortion, shorter cord, less expensive, etc. For their warranty service alone I wouldn't recommend a Koss product; however, their A250 ... is actually well-regarded by some professional reviewers.