It's a great achievement to make something like that since I guess it's only one guy doing it with his own money, and even though hw says that's a prototypr, it doesn't look comfortable. When he uses de right stick and the right trigger it looks like the right trigger is almost out of reach. And he shows the device from the front all the video, but when you see the top in some angles you can see it's REALLY thick, like 4 or 5 times the size of a smartphone.
Anyway, it looks fun.