Just watched all their videos.. seems at first that many of the videos were made using repeats of previous footage. I kinda had my doubts. Then the last few had very different footage and even different changes to the actual Kite. The final being pretty impressive. I assume they got some MAJOR backing financially in the last year or two.
This would be nice for emergency power generation or for remote areas but putting something like that up high enough where full scale aircraft fly could become an issue with more and more people who don't like to follow rules flying private craft possibly crashing into them.
Time will tell and I am sure that more then a few will be used all over the world for various applications.