I own a 4 years old Mercedes E 300 D with Distronic plus ( Adaptive cruise control). Since I drive a car with the adaptive cruise control, this option has become a must in any premium car for me. I will buy a Tesla Model S in a future because I love electric cars and I love Tesla but I think Tesla must offer the Adaptive Cruise Control Control at least as an option. I am pretty sure that in a close future we will be a Model S and a Model X with the Adaptive Cruise Control.