Looks like it's got a slip clutch (with no safety shield). I wonder how well it works and how much power it needs. It looks like it could throw objects quite a ways. Commercial models like the Baumalight CP560 have side shields that extend farther forwards. (they also have four blades and claim to cut up to 4").
I'd really like a forestry mulcher on the front of a track loader but that's kind of expensive. Even a mulcher for the back of my tractor would be expensive and my tractor can drive only the smallest ones that would choke on our large brush.
We can't burn here and brush left in piles just sits there for years. I'm using chain saws and 8" pto chipper for the larger brush. Stihl FS240 brush cutter and a rotary cutter on the tractor for smaller brush. it's slow but I've cleared a good fire safety buffer around the house.