i have the Logitech Mx 518 mouse i still havent understood the whole DPI concept .. is it of any use to me as i play on sensitivity 1 - 2 .. ?? how can i make sure i dont have to change my sensitivity .. at home i play at 1.4 but in cafes i have to change it to 1 - 2 - 3 depending on the cafe .. (the mode on the mouse is the same - the least) anyone with any experience ??