I think his real issue is market fit. He only talks about his vision, what he wants to do. Not a word about his customers. The ability to run that fast is amazing, but the boots themselves are ungainly and the stride looks awkward as hell. I wonder what kind of speed boost he could get in a boot that looks more like a boot than a pair of stilts. I'd bet there's a bigger market for a "normal" boot that gives you, say, a 10% boost in speed, than these things.