A notoriously heavy and bottom-heavy vehicle at that. I would not want to be caught upside down in one of those, knowing that there is a tonne or so of batteries trying to crush me.
2. Reinforced pillars. Their strength is such that they damaged the device used to test roof failures [2] (I believe the force the roof was subjected to was equivalent to 5 Model S' atop the test vehicle). I'm confident that in the extremely unlikely event the vehicle was upside down, you would walk away from the vehicle, roof intact.
3. A tweet describing the safety of Tesla vehicles: https://twitter.com/NickatFP/status/706845770486407168
[1] http://electrek.co/2016/03/07/tesla-flip-model-x-crash-tests...
[2] http://www.roadandtrack.com/new-cars/videos/a5238/watch-the-...
Tesla should start doing ads like this:
http://www.curbsideclassic.com/wp-content/uploads/2012/04/19...
https://d37nk263jfz2p8.cloudfront.net/image/1/700/0/uploads/...
That doesn't mean you "wouldn't be caught upside down in it" unless it can literally flip itself back over after every possible roll.
I would still prefer to crash a Model S than any other car