Pros: Bass, in-line mic, OK SQ
Cons: Harsh treble, sound compressed, poor cable
These are solid IEM's. I've owned mine for about 2 years and they're still working. They're showing serious wear, but still working. They are decent at low volumes but the bright mid-range and grainy, sharp treble is tough to listen to a lot of music through. The newer versions of the S4 seem to be an improvement. The bass is decent, but lacks extension and is a bit wild. Definitely bleeding into the mid-range.
The cable is fine, but it is permanently "coiled." This is very obnoxious. However, they've seen a stupid amount of abuse and the cable is still holding together fine. This is very impressive. The tips fall off far too easily but they do work well for me.