I rode in one in Austin TX for the first time last weekend. I was going from UT back to a hotel in a different part of downtown. No complaints, it was a smooth experience granted it didn't face anything I would see as out of the ordinary or unexpected while driving. Edit: well one thing i thought was interesting, it came up behind a delivery truck stopped in the lane. Instead of just stopping and waiting forever, which is what i expected, it turned on the blinker and got in the oncoming traffic lane, passed the truck and then returned to the correct lane. It crossed two solid yellow lines on the road to do this which is usually a no-no but in this case fine. That stuck out to me as something rather advanced to automate (when to wait and when to pass/overtake)