Oh boy, usually I think a lot of people over-react on safety stuff, but he is riding a very fine line. Keep you dang hands away from the ram and wedge!!
A couple mods would be to grind the "spikes" off on the ram, so the wood does not stick to it. Cut the chute off right at the wedge. Make the chute in a V-shape so the logs will self center and not have to hold them in place. Otherwise, it is a pretty efficient machine. Limited on the size of the wood, but I guess.