Pros: very flat frequency response, wide soundstage (for earbuds) good definition and separation.
Cons: cheaply built, easy to fake.
Looking at the picture of the PK3's I wasn't expecting much. They look and feel cheap using a generic case for the drivers making them easy to fake. (In fact my first pair were fake!) these earbuds sound GREAT! Especially considering the price ($44) I have a few pair of earbuds in this same and higher price range and these PK3's knock all of them out of the water. They have a flat sounding frequency response some say a little bass heavy but i don't agree. What surprised me the most was the large open soundstage not common in ear buds. Using sansa clip + with rockbox.