I was worried about the “diffusion of responsibility” issue, so I rented one on Turo for the day and drove around 200 miles on freeways in Northern California. The user interface is really good, you learn pretty quickly the right amount of force to hold the wheel - then you can let it “autosteer”, but taking control is instantaneous, you just make the movement you want and the car disengages autosteer instantly. I probably took over from the car around 10 times that day, mainly in the left-hand lane with the left edge of the freeway marked with 2-foot-high white concrete barriers, it felt like it wanted to go into them. But that might just have been the car trying to drive “properly” in the center of the lane, while I tend to hug the right side in those situations to have a greater margin of error on the left.
It definitely reduces the cognitive load, letting you drive better in my opinion. But there isn’t an idiot-sensor in the car, so like every technology, there will be people who abuse it. The interesting question is whether those same idiots would be safer in a regular car, or if, on balance, the “autopilot+idiot” combination is safer - that seems like an empirical question to me.
Even at the current level, it’s a great advance on a regular car (I have no idea how it compares to other expensive cars with various assistive technologies, I usually buy super cheap cars...). I also think that if fully autonomous driving is technically possible, then Tesla will be the one to do it - they have several hundred thousand drivers giving them training data in all sorts of weird edge cases every day.
It really is worth watching the whole of the recent investor event at Tesla and then deciding what you think of their technology: https://www.youtube.com/watch?v=Ucp0TTmvqOE