I'm also highly skeptical. I've heard from someone in the industry that their original demos were intentionally misleading. They had images of the Lilium aircraft taking off and flying for a bit, but what they didn't tell you was that the thing that was flying was essentially a large foam model that probably weighed 1/10th of what the real thing would. I don't know if that's the case anymore, but I wouldn't personally invest my own money in them though. Joby seems like they have a much more promising electric aircraft.

I don't have a position in either company nor in any electric aircraft stocks.