It will be more precise than the Sniper alone. Acceleration is a big hurdle and Halo 3 has a lot of it. This is why I added the TranslationExponent knob in the configuration. The Sniper uses a straight linear mouse translation. The XIM gives you the option of choosing a curve based on an exponent that helps counter the acceleration. Mathmatically, it can't totally remove the acceleration, but, it helps a lot.