Basically I had a bank overgrown with sumac trees and briar bushes and needed it gone. Tried the chainsaw, but that didn't work too well because I didn't have a brush bar. Tried the weedeater too, and that also didn't work, even with the brush blade.
My 1987 Dodge 4x4 worked much better....till I got it stuck on some tree stumps. Alas. Darn bank is still rather unfinished some few months later.
Btw, this method is great for clearing old corn fields too, as long as there is ample mud.