Free anything is great but perhaps this isn't the fantastic deal it may at first appear to be. If you drive the average 12000 miles a year at the average 333 wH/mi and pay the average $0.11/kWh for electricity at home then you would spend $439 per year on electricity (for the car). If you did all your charging at SC's instead of at home you would save that much. But I found, and no surprise here, that only 9% of my charging is done at superchargers. Thus my savings would be $39/year. That's enough for a decent lunch but nothing to get excited about. Of course if you live in one of those places where electricity is $0.35 kW/h and/or your planned use involves more road trips than running around town/commuting you will get different numbers the point being that maybe you ought to run some numbers.