Bought for 420. Sounded immediately, without warming up. I tried it on fifty songs - everything is fine. The frequency response is perfect (for me), highs, mids and slightly raised bass. Speaking of bass, it is deep down to infrasound. Equalizer is not needed, everything sounds as it should. You can hear the overhead of heavy MP3 compression, and therefore low bitrates are not recommended. They sit perfectly in the ears, do not fall out. The sound is loud, even on nokia 5230. I add that they died a year later and bought the same ones for replacement. And they are different (oval sound guide). The sound is terrible. Switched to Sony MDR-EX15LP.
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