its a $50 game, that is not worth it!
it has only 30 tracks when GH2, and GH3 have about 70 each
if the game was about $30-$40 i would consider it, but $50 is a no go.
there are only about 1/2 the characters as GH2, and you cant change their costumes.
Their are no bonus tracks
The 30 songs, in my opinion are good though, but overall its still not worth it.
My Advice: if you are considering this game, just wait for GH3, or pick up a used version if you can, and dont pay over $30.