My Stihl FS110, The area you see was thicker than the background in this picture. Autumn Olive, Vines, berry thickets. This Brushcutter gets through it all with a Razor Renegade blade.
I have the stihl blades, star, notched etc. But the Carbide is my choice for tough areas and new trails.
I cut through 2-3" berry thicket and autumn olive without issue.
Rocks can chip the teeth, but so far only on my second blade, where the other blades I had to resharpen almost every outing (so 2-3 hours of cutting).
I also have that Makita drill, and buy batteries on ebay. It still works > 20 years and through 3 houses.
Most of my tools are Makita M12/M18 now. Only disappointment is the quick lock pole saw.
It is slow and needs a
thorough cleaning to oil properly. But it works. Chain loosens up in long cuts, even with a sharp chain and nice chips.
Have not replaced a battery yet, understand they had bad batches of 12AH and the 9AH was not reliable.
I have the 5AH and 8AH (which are my preference for the weed wacker and pole saw) and one 3AH which I use on my light. The blower is pretty decent and I can use it inside the garage without suffocating.
I have the Echo long (225 I think) hedge trimmer for the ornamental grasses, burning bushes and large hedges.
Really takes a lot to cut the larger ornamental grass and it used to down my old trimmer.
And doing a few hundred feet of bushes is easier since I can pretty much walk it along the driveway.