Does Supercruise work without OnStar?
In order to operate Super Cruise, you must have an active and eligible GMC Connected Services† plan. Super Cruise vehicles are also connected to OnStar® Emergency Services†, so Emergency-Certified OnStar Advisors can assist drivers should they become nonresponsive while Super Cruise is active.
So Super cruise is $25 month and Connected Vehicle plan appears to be another $25 month= $600 year vs Ford's $800. With these prices you definitely would only want one self driving vehicle per family.