Uhh yeah it really depends on your mouse. To test it out you wanna move your mouse left and right and see if you got full 360 degrees movement around with little left and right mouse movement. Just move your mouse right, and if the distance isn't so long to do a 360 then it's a good sensitivity. I normally play on 70 sensitivity, and 45 sensitivity while sniping. So it's pretty much basically what you feel comfortable with. You don't want something so slow, but to fast, though. Fast sometimes is good, but it takes a while to handle it.