I use 1 with a 4000 dpi mouse. I used to have 0.8, but I started getting some issues with it so I rounded it up.
Pheeks, you got an 800 dpi mouse, so if you put 5 sens on, you'd have the same sensitivity as me, because 1x4000 = 5x800 = 4000.
MyeRs here has a ball mouse (400dpi), so he's using 15x400 = 6000 (50% more sens than what I got).
I don't think there's a name for the actual sensitivity you're using, so may I invent it?
I use 4000
as.
Ball mice = 400 dpi
Cheap optical mice = 800 dpi <-- what you got, pheeks