The fact that you can train on a specific part of a song is a plus also (pass such complicated to pass). I have not yet tested the various mini-games, but the playlist is already complete.
To note, and it's important enough anyway: use exit "Audio" specific, and not that of the TV via HDMI, otherwise you will have a lag between when you actually play the notes on the guitar and the time where you will hear the note in the game. Personally, I picture the HDMI cable (on the TV) and audio through the optical output of the PS3 (connected to a sound bar), and it works fine (the possible connections are described in the manual of the game).