I just got On Tour and I've been playing it off and on (Space Invaders Extreme currently owns my soul). I'm kind of at odds about the game. My fingers are fairly meaty, so the Guitar Grip is anything but comfortable. Having to keep my wrist bent is not fun, either. Strumming recognition is spotty. I'm not sure why Star Power activates automatically (seems to, anyway). Having to listen to "All Star" brought me to tears.
On the other hand, there is some very sophisticated tech in this game. The graphics are amazing considering the hardware, the fact that the Guitar Grip WORKS and works WELL is awesome. My meaty paws are my own damn fault, not the game's. It's not like they included my clubbed fingers in their focus groups.
I'm having trouble with the Lefty Flip. I have to play it left-handed, I'm sorry, butu I'm a lefty. Thus, it's very easy for me to get the buttons confused with their onscreen avatars. Far too often, I press Green when I'm supposed to be pressing Blue. Maybe I should just play righty...
So I have mixed feelings thus far. I appreciate the concept and technology involved, but actually playing the game is hit or miss.