Ok not to be nasty or sound rude but the offical Halo profile was rubbish as it did't feel right or work well for a halo game.
Being a massive Halo fan I have redone it so it is very close to the actual setup from the xbox! It has been slitly modifed so its a little closer to Halo 3 but it still works great!!
The only issue I have is sensativity as everyone likes it diffrently so I have left that alone you will need to setit up how you like!
If theres any setting that can be fine tuned then please do so but share it with us.