This thing is incredibly cool but a few of the details are off.
400mph is highly unlikely, the youtube video in the link says it was lasered at 366mph and the official guiness record is something like 337mph (averaged after a downwind speed of 345mph).
Second, the fuel efficiency on those microturbines is nothing short of awful. It might as well be a rocket for as fast as it guzzles through the fuel. It's 17 oz. per minute for the one in the video, meaning he probably burned up nearly a gallon in his less than 5 minute flight there.