Post why you like the speed you pick too. I am currently using 5, but have been switching it around to see which has the best advantage. The faster speeds are great if you can control them because you have an advantage in close shoot outs, but slower would be better for sniping and further away confrontations.
i use 3, i really don't see that big of an advantage in having a higher speed, chances are if someone's got the jump on you and starts shooting you in the back you are already dead
I usually use 7....but when I know I'm going to be playing a sniping level I'll change my sensitivity to 5 so I can snipe easier
3 (Default). Might start messing with it before Week 1 of Halo 2 matches to see what I like, but for now I am sticking with default.
I set mine to 7 before I even started the game. I did this because I heard it was a big advantage. I may tone mine down a bit now?
I wouldn't unless your constantly missing your targets because it's TOO sensitive. However, you might find a lower setting such as 5 easier to aim with.
I just struggle with the Sniper rifle here and there that's all. I think I will tone it down just a bit for that reason only.