Come January 25, a demo for Bulletstorm will be available on Xbox Live. You can try - what is billed as an outrageous shooter - and then compare it Gears Of War. Of course it will probably be nothing like Gears...
This game will sell either way as the Gears of War 3 Beta is tied to the Epic Edition of the game. The Epic Edition sells for the same money as a normal edition so there's not much decision making to be made.
Bulletstorm is due February 22. The demo will be available January 25.