I have mine set to 10. It comes in handy when ppl start shooting at you from behind cause u can turn a lot quicker to return fire. If you up ur sensitivity by one or 3 each week u gradually get use to it and it becomes natural after awhile
Its kinda hard when you play so many games that make you change your sensitivy when you play better at one when your playing one game and then swap off to another game you play at a totally different sen.It really all depends on the game.