The bucket shears them off, no real 'cutting'. It stays in big tumbleweeds, as you roll it up. I can grapple it to compact, and push into the chip truck. A log in the grapple can shove the pile to the cab-end of the dump bed, or the next load of brambles. The buckets front edge is a slight blade, and bites into the woody scotch broom, pushing it out at the root, which is ideal, and hard to do by hand, unless you have a Weed Wrench
http://lewrentswest.com/equipment.asp?action=category&category=51&key=PULSB
Picture a super, giant skidder going pushing its way through saplings with the blade, rolling the whole mess up in front. As you build a 'snowball' of material in front, you are pushing with something now even wider than your blade, clearing land fast. If you get too much resistance from this growing mass in front, and the rope-like effect of hundreds of vines (like Gulliver), you just back up and push from a different angle, instead of coming in from 6:00 position, you come in from 4:00, and the mass breaks free.
I was able to clear a large section of black berries for an old guy with heart trouble in 20 minutes, He would never have taken on the challenge. Rat habitat turned into a place to blow lots of cottonwood chips for mulch for a new orchard and native species planting. Saved me getting my chip truck backed into a long winding narrow driveway, numerous times. I saved money on a bid price job, and gained ease. They won in that they got rid of a problem that only gets harder to deal with the larger it gets. Those blackberries were probably 10' tall in places.
Way less work and risk than treework. A very niche piece of equipment for a problem in our area, small, light, narrow/wide, agile, tracked.
Little coordination with an employee. "take the brush cutter, clear around anything we want to keep", ... plastic covered green house, overgrown plants, faucets, overgrown pallets, pots, etc.
The Ogre takes care of all the coarse scale work, lickety split. I can let my mind wander a bit, not having to focusing on coordination of crew-dependent tree operations. Kinda nice and low pressure. Balances the tree work, some.