I don't know how many of you have actually owned and used a Bark Buster, but I've had one for many years and split hundreds of cords of firewood without incident. First off, you don't have the pto spinning full steam. You can leave the tractor just above an idle, so the screw turns pretty slow, not whirling as some think. Secondly, I can put my gloved or bare hand against the tip while it runs, and it doesn't catch, the tip is designed that way, plus there's a guard that prevents you from walking into it. Thirdly, it's designed to split 16" or longer wood, not long logs. Fourth, the wood CAN'T catch and start spinning if used the properly.There's a pipe that you rest the one end of the log on before you press the other end against the screw, and it prevents the log from spinning.
I can split wood TWICE as fast as my brother with a hydraulic splitter, without even trying. I just think too many people look at them and run scared.