I've never had any want for one, but a buddy in FL has one. He also has solar panels on his roof and a big Tesla battery for the house. He claims to having capacity to charge free. The system was a little over $100k. I was with him for a few days in the car. It is strong. My favorite geek feature was parking. We pulled into a random lot by a restaurant. On the gps, it had the parking spaces mapped. Some had square edged rectangles, others had rounded edges. I think the rounded ones were the occupied spaces as noted by the onboard cameras. He would stop, jig some doohicky, and the car would back itself into the closest empty spot.