Guitar Hero III: Legends of Rock

I don't own this game, but are looking to buy it for my xbox 360 when I can put together a bit of cash.
I've played it in shops, and with some of my mates.
Absolutely love the game, especially the two player, and tracks.
Favourite track=Through Fire and Flames.

What do you think?

I'm a Medium master!    Only problem is I've got it on the Wii.

It's a great game don't get me wrong but it gets boring after a while when you've unlocked all the tracks...