I'm just basing my assumption off of what happened with GH for PS2, where it was possible to buy just the game, without the controller, starting right around the time that GH2 came out. I don't know for sure, because the first time I ever heard of the game was at Christmas when my roommate got it. :)
Personally, I have the Xbox 360 version, and I'll be buying the one with the guitar, for precisely the reason you mentioned, the 2 player mode.
3
I'm just basing my assumption off of what happened with GH for PS2, where it was possible to buy just the game, without the controller, starting right around the time that GH2 came out. I don't know for sure, because the first time I ever heard of the game was at Christmas when my roommate got it. :)
Personally, I have the Xbox 360 version, and I'll be buying the one with the guitar, for precisely the reason you mentioned, the 2 player mode.