Pros: Detail, comfort, isolation, clarity, soundstage
Cons: Too sensitive, light bass
PROS: The detail of this iem is fairly impressive, with its strong points being the treble. They are very clear and detailed and may even seem sparkly. The bass is fast and detailed. The sleeves are very comfortable provided that you get a good fit, and these can easily be worn for long durations. They offer excellent noise isolation to the environment, and oftentimes one may turn their music volume down due to the strong isolation. The soundstage it provides is large and goes all the way around the head in all directions.
When mixed with a natural sounding mp3 player (such as the Fuze), the user may experience sounds in their music being mixed with the real sound outside.
CONS: These headphones are very sensitive. So sensitive, that if the source has noise in it it will capture it and output the noise at audible levels. On my xperia x10, these players output a decent amount of background noise, at whispering volumes. These also suffer from an insufficient amount of bass, even to non bass heads. The bass is certainly there, but may be inadequate to many.
In the end, I'd consider these headphones a great buy, even with their minor problems.