In three afternoons I took down, chipped/ raked, and happy to say stump ground my tallest to date removal, about 155' x 32" dead grand-fir. Just have to move the logs into decks a little better for a bandsaw mill, load the mini, and go. Pretty low stress, honestly. It leaned this way and that a bit, but always able to under cut the COG, or use a Magic Cut, only using a rope on the butt, and moreso wedges.
Once I figured the subtleties of the grinder, it plowed through surprisingly quickly for beat up pocket teeth. Fine stump chips. I ground all the way around the stump, and cut it lower. Easy enough to swing it side to side. Funny machine. Waaay less work than what I remember a Dosko handlebar machine being, back in the rental days.
It has a very small hydraulic pump, only for the wheels, 22 horses to the stump, pretty much. I wonder how much HP is used up in the SuperJr hydraulics. Definitely not a replacement for a full hydraulic machine. It's smaller than the SuperJr.
This is just after cutting a thick cookie off, before resuming to grind the bulk of the core, and way below grade.