Ranked in these QuestionsQuestion Ranking
Pro Outstanding sound quality
These may be the only earphones out there (at the moment) that use electrostatic drivers. It's a unique and complex technology that provides sound quality that beats any competitors by a wide margin.
Pro Amplifier included
Portable amplifier comes with the earphones.
Con Requires a sizeable amplifier
You will have to carry a separate, fairly large amplifier along with the earphones in order to listen to music.