Non tesla driver here
I test drove a Model X. Got the sales-person to turn on Autopilot
Car immediately accelerated hard and pulled sharply to the left, presumably to find the line, only it was sharp enough to have taken me off the road had I not resisted the turn which stopped it. Autopilot was immediately turned off again.
It's not fully autonomous, and I wouldn't be happy to leave it trying to drive without my guidance/overwatch if I were to get one.