A quick word on them from someone who can't accurately use fancy audiophile terms.
Bass: Nice amount; not muddy, but not lacking.
Mids: Vocals sound fine, although, I prefer male voices on these a bit more than female voices.
Highs: Fine? Nothing peircing and unnatural sounding.
Soundstage: Difficult to describe without using terms that I don't know the meaning of. The soundstage sounds more open and unique than IEM's I've tried (not many).
A quick note- I amm actually hearing instruments that I had never heard before in songs that I know pretty well.
Caution: The words above are extremely subjective, so YMMV.