Headphone jack is shoddy quality. Two friends have it, I plugged in headphones ($99 Bose.. not spectacular phones by any means, but good enough) and the quality just sounded poor. Not enough bass being passed through in comparison to my 80GB. Treble was kind of shaky, too. Same files, no EQ, etc, as my 80. I couldn't believe it.
weird mine had some good quality for the bass. but i do agree the headphone jack because the headphones would always fall out.