Summary: This is great for the price. Its sound reminds me of Stax headphones or electrostatic speakers, both of which I don't own, but have heard on a few occasions. It needs extensive(100+ hours?) breaking in to help tame the highs and bring out the bass.
Pros: great clarity and detail
Cons: highs can be too strong at times. No strain reliefs on buds. Plug is not right angle
Conclusion: Despite their somewhat bright and harsh treble, the JVC HA-FX40s do have a lot going for them. The fit, comfort and security are excellent, especially for only $30 — and they still sound noticeably better than the dreadfully awful giveaway buds often included with your MP3 player or phone.
Pros: Noticeably better sound than stock mobile-device earbuds, Plenty loud with any device due to high sensitivity, Good amount of bass, Angled ear tubes and rubber-fit stabilizers provide comfortable, secure fit