I bought my xim4 when ghosts was out, and it was a MASSIVE improvement to my game. It basically was borderline unfair against gamepad players.
With advanced warfare, not the case due to the design of the game. Aiming in this game is like swimming in oatmeal, and they pretty much aim for you if you get your cursor close on the gamepad. They were forced to overcompensate because they broke cod with these dumb jetpacks.
xim4 has put me on another level in destiny pvp and in ghosts, the product is fantastic, the problem is advanced warfare is some strange socialist experiment to force everyone into a 1.0 kdr so nodoby gets there feelings hurt.
Wait for Trey to make a real cod game, where players actually have to aim and land their own shots, and there is some semblance of map control and strategy, and we will be back to destroying again.
ps, its bs that it takes time to adjust, aw is just a lousy cod game.