Using a Logitech G9X with setpoint software installed. Set mouse smoothing to 0 in the software (which completely disables it), allowing the dpi modes to be used properly. I use the top dpi setting of 5700 as its brilliant for snapping to targets in FPS games. I have 4 lower modes all available to me at the click of the side switch below the left mouse button though allowing me to slow the dpi down to do more accurate long range sniping as an example in the same games.
Without turning mouse smoothing off in setpoint (even though its off in windows), the top dpi level spans the entire screen in about 1mm of mouse movement.