Pretty cool, although it's polluting so hopefully it wouldn't become too popular (probably not).

"And because such diminutive payloads don’t pose a danger to aircraft" even though they are small and wouldn't make a plane crash, I can imagine they would cause some damage if they ever enter a jet engine, although that would be unlucky as they would mostly fly higher than aircraft. I also wouldn't like it to fall on my head, but with the solar panels as depicted and the small weight I suppose it could somewhat glide.