I posted earlier about seeing a similiar cutter operate. Obviously some judgement needs to be used to make this machine safe. What machine don't? Anyone cutting a tree with a severe lean in the direction of the tractor probably deserves to have a tree on them and get them out of the gene pool. I can only relate my experience, and never felt uneasy with cutting trees with this machine. I expect some of my confidence in this machine stems from my advancing age and the inability to run a chainsaw all day long. I didn't have to push the buttons very hard on this machine to take down a tree, and could last all day. My personal machine is a skid steer mounted hydraulic motor powered saw. My skid steer saw only develops about 36 HP at the blade so does not cut as fast and will only cut about a 14" tree without working both sides of the tree. This is a land clearing machine and not a firewood cutter. It will lay enough wood down in a couple hrs. to keep firewood chainsaw operaters busy for quite some time. I agree that this is for use on heavy tractors in the 85 to 100 HP range or even bigger if the gearbox will handle it.