I am very satisfied with this product.  It sounds great for music and has good volume for phone calls.  Two things are disappointing though.  First when I use the second ear (for stereo) the clip for the microphone side does not fit behind my ear at all.  I have small ears, but this thing is massive (must be made for Dumbo).  Secondly, the ear caps suck.  The smallest cap (I got three sizes) hurt my ears because they are too large.  I cannot imagine anyone using the largest lize.  I took the caps off of an old pair of Sony noise-canceling earphones and it works fine now.