I love this app. I do not need my ipod at all anymore. I use this with mixzing with last fm scrobbling turned on. I use smart play-lists in iTunes(one of the only things I love about iTunes) Just mount your SD card open the program and it automatically opens iTunes and syncs your play counts. Then just click the play-lists you want to sync (the program remembers previous selected ones) and press sync. It will then remove any music not in those play-lists and update and new music and selected play-lists to your SD card. Dev is actively making this program better.