Yeah, I don't know what it is but Klipsch just has some damn good audio gear. My nephew's friend had a desktop speaker package from them. They were 2 tall and extremely narrow (width wise) front speakers and a subwoofer. That setup rivaled my home stereo (MTX Home Theater Series 12" 3-ways). The sound that came out of speakers that small was amazing. The bass out of the sub was loud but accurate as well.
After I got my S2's, it felt to me like they took the sound out of that setup and put it in earbuds. The only thing I wish was that the inserts that go in the ear (the clear rubber) had a set one size smaller than the smallest that came with them. Maybe I need to call Klipsch and see if they have a smaller set of inserts that work on the S2's. But other than that, for the money, those Klipsch's are the best IMHO.