Great presentation, only thing I'm worried about is human flight in these things. I mean what happens if this thing is 1% off on the landing? Does the whole thing topple over and blow up into a million pieces?

Additionally with the entire flight being automated, what happens if the software gets taken over in space and they just drop it like a rock onto a city? The damage would be catastrophic. We need Elon to invest in city wide force field technology too it would seem.