Ok so I brought this game a while ago, and it hasn't let me down.
It has about 30 tracks, even though this isn't as big as the games for Playstation it has really good ones e.g Helicopter by Block Party.
This version is lacking the 5th button mucking it somewhat easier but still has all the different difficulties.
The only thing it disappoints on is the lack of wi-fi play, this game does have multiplayer (the battle mode , great fun) but can not be played over wi fi which would have been awesome.
I will warn after reaching the hour mark you will need to put it down for 5 mins due to the cramp factor from playing but its worth it.
An aspect that keeps you playing and improving is the unlockable songs, guitars, finishes and characters making this game have endless hours of gameplay. Its also good for practise for the bigger console versions of the game.
It's just like a mini Guitar Hero :D