Its interesting. The engine has a horizontal shaft and two belts. The belts drive the transmission forward or reverse. There's a PTO shaft sticking out of the front of the transmission that drives the blade when engaged. Any shear protection? I can't see anything but a pin that locks the pto shaft to the implement. If you smack something hard with the blade, you have several shafts, gears, gearbox, another shaft, a 4th shaft, transmission, wormgear, etc... before the drive belts will slip. On the DR, the blade is belt driven, isn't it? That would provide slip. If it sounds like I'm picking it apart, well, yes, I am. I've been disappointed with lots of their stuff over the years. And I've been satisfied with lots of their stuff, too. I've been burned by their positive reviews on products as well. So, I'm highly skeptical.