To the point, these earphones lack the upper highs, and lower mids. You can't really judge earphones for their lower frequencies, unless they are over $200, so I won't do that for these. So judging on their mids and highs, they deserve four stars.
The sound is overall decent. Much better than cheap earphones that are included with phones and on the airplanes, but not on the same level as other premium music earphones I have had in the past. The lower highs are good, clean and clear, but just lacking the crisp clarity of cymbals and high-hats. The mids are decent, with some meat to it, but not satisfying enough. Overall, I would rate the audio quality as 6 out of 10, but since the price is very nice, and the material quality is good, it deserves four stars. I also like the packaging, and the included rubber pouch. Small nuances matter and add to the overall quality and impression of a product, so I will give them points for that.