although the cheetah legs are the way to go for a high-speed biped, i'm not so impressed by this demonstration - the boom tells me they are only at gait development, working in the first of six degrees of freedom.
it's fast, but dumb. the obstacles cleared happen to fit under it's stride, and are cleared (barely) after the 1st foot crashes into it for the 2nd foot to land on. while airborne, the rig continues its stride as if it were on the ground, because it has no idea if it's on the ground or not. as for the "tail" it looks like it serves as more a gyro than active balancing. i guess it also acted like a nerf bar. humans do the real thing with actively controlled powered arms, but the concept has already been demonstrated using freewheeling weighted arms, left to find their own rhythm in the gait.
i give it a "meh" until they reach a great deal more maturity.
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