I'm no expert at this but I can tell there was no difference in sound quality of the IE60. I owned an NVX earphone. When compared, there are both similar. Sound quality of the IE60 only provide clear sound but no other advantages ranging from bass to treble.

No controller. No mac phone. And not enough fashion. Lots of some item for u，and good sound.

Well controlled bass; great vocals and detailed mids; impressive accessory set; comfortable and easy to wear

Highs are not the most detailed; not the best bang-for-your buck set with $249 price tag

Recently returned a pair of RHA T20i earphones worth ￡145; These Sennheiser IE60's blow them out of the water; The Bass response is great and not overpowering, the sound is super crisp and crystal clear - imo its very balanced.

I honestly can't fault the sound quality; If i had to criticise, i would say that the cable could be thicker to improve durability (They don't tend to last over 2 years, which isn't actually such a bad thing as they come with a 2 year warranty which means you're always covered).