I test drove one and got the Tesla guy to turn autopilot on so I could see how well it worked.
Car immediately a) got the speed limit wrong and tried to accelerate to 10mph above the speed limit and b) tried to pull off the road onto the verge as it failed to properly detect the edge of the road.
Needless to say, I'm not getting one in its current state.
It seems to be another case of static objects being ignored as noise, otherwise anything from overhead gantries to stones on the road would cause the vehicle to stop.
It just isn't good enough at understanding what is going on around it. While I will not get a Tesla with autopilot, I do look forward to autonomous vehicles which do have the required level of perception (sensors and analysis) to cope with hazards properly.