It's nothing like "guitar hero" for the iphone. More of a simon clone where you repeat the pattern that the computer gives you. Starts off REALLY easy and stays that way for about five minutes...way too easy. Music is pretty crisp and sounds are polished but i experienced some skipping music and delays in the menus (OS 3.0 /2g touch). Wouldn't even pay a dollar for this, but it's worth a look if it's free.