With sync I mean full oneway sync with playlists created in the music player. I create a playlist which I'll then listen too in iTunes and with 2 clicks it's fully existing on the phone, with the .m3u playlist file, recognized by the media player. If I add/remove songs, change sorting in that playlist, the result is completely synced on the phone. I didn't find anything simple as this without extra fuckery and praying I can rely on it. It just works.