As list in the summary, I don't like this product, and I will not buy any product from Philips because of the post-sale service.   After I tried replacing all of the ear-pieces in the box, I finally confirm that the sound quality of S2 is bad.   First of all, I could not hear any bass instrument in most of music. It's less even than V-Sonic VS1D.    And the High-Mid is boosted too much. The sibilance of female voices is very noisy. Listen to J-Pop is in hell.   The over boosted High-mids also make electronic guitar aggressive, thus the Solo...