Not super sharp, probably need the blade height adjusted or whatever. I drug 2 hackberry branches to it with the mini, both too big to put in by hand, so I used the mini. Had to hold the load a couple times to avoid stalling it, basically me and the mini were the feed auto feed wheels. It worked well, but ended up being a bit much at the brush end. I had to pull some brush out to finish feeding one of the big ones.
The mini is good for forcing 6-10" logs through. Occasionally it will suck an 8" hand fed, but often kicks out anything over 4". I think decreasing the blade gap would help it finish bigger wood and actually chip the brush. It tends to leave a strip of wood under the drum on big wood and fills the chip box with stripped sticks instead of chips.
We've put some big 20-30 footers through it in one go.