That second video looked none too steady, to me. Personally, don't think I'd want to go up in something that has a tendency to occassionally fly backwards and then spin in circles a few times...
I'm pretty sure that the flying backwards and spinning was the pilot showing off, rather than lack of control. Check out the precision he has when he shoots straight up, and then comes back down to a stop inches from the ground. It's a very stable hover with barely a hint of wobble.
It looks like 2 different vehicles. If they are 2 videos of the same vehicle, they have modified the vehicle considerably between shoots. The 2nd vehicle does not have wheels, is capable of VTOL and has a different pilot position from the first vehicle.
Even so, both vehicles look pretty cool, although I'm a little dubious as to the size and speed of the rotors in the second vehicle giving enough lift, and the fact that it was flying so close to overhead lines. It could be a well made hoax.
Never got that far off the ground and never reached such great speed, but my pop has made three human powered hover craft in my lifetime. Pedaling to power the engine (and no whirligigs either, those are mad cool though). Bet if that weren't the case he's have broken more limbs by now. He's gone to three movies since I've known him. One was Star Wars and I don't think he paid much attention to that after the hover craft made an appearance.
Every mad tinker I knew growing up did pay attention to power lines and such details but usually not so's the popo/loved ones wouldn't be nervous. The vid looks like a pretty vacant area. That'd be perfect.
And now all this has me thinking I should call him. Says if I will learn the physics of it, he'll go ahead and patent and it'll be his legacy to me. Probably too late, maybe not, it is slightly different.
In any event, when I first saw KK tooling around on one it did not at all seem outlandish. Thanks for these links to the flying man, will pass them along.