it does work but its one of those glorious ducati things that they dont actually tell you how to use!
after you return from a run, turn the ignition off; then to read lap timer hold the right button down as you turn the ignition on again. as all the lights come on the dash release the button and you will be in lap timer playback mode. now just use the left key to toggle through each 'lap'.
be careful not to hold to right button down for too long when turning on ignition as that will clear all the times, i think 10 seconds.
also your top speed on the lap timer is 'true speed' so it will be about 8 pct lower than what you see on your speedo.
for example my speedo was reading over 170 but the true speed was 157. private road obviously.