I have the new ergonomic iPhone 5 EarBuds, and they work very well when I plug them into my iPhone 5.
However, when I plug them into my HP PC at work, they are totally distored. It sounds exactly like when there are 4 speakers but for some reason, only two of them are playing on surround sound in a home theater.
They sound absolutely terrible! If I had to describe how it sounds I would say that the treble is very loud, and voices and bass are almost inaudible.
It is worth noting, that all my co-workers have put in their earphones into the PC and all other ones work without this problem.