So just coming from a car that had HUD my 2015 M3 would display speed, navigation directions, and alerts (such as low on gas warnings and such). In sport mode it would show RPM, shift alerts, speed and gear. Pros: I never looked at the instrument cluster. Great on the track racing. Cons: Did not work with polarized sunglasses. Clutters the view ahead, a little in your face. I walked away from HUD thinking eh I could do without, not a deal breaker at all. So I am putting it out there if Tesla does a HUD is it good or eh.