I use a Kubota 3130 4wd with a box blade and a front end loader. The front end loader handles about 1300 lbs, but if I hook a root with the scouring teeth on the box blade it's pretty sure to move or break any surface roots left behind by the stump grinder, assuming the guy with the grinder did his job. The tractor is small enough to make it into most back yards.
Still, $22,000 for the tractor, front end loader, and box blade is a pretty big expense compared to $450 for an "Alice". Looks like a great tool.
I have used a step ladder with a Maasdam Power-Pull in the same fashion as the Alice is rigged, but you have to stay under the load limit for the ladder. You can only get about 300 lbs that way. I've bent some ladders, too. Hard to estimate the load without a dynamometer. It helps to put a 2X6 across the top of the ladder and under the sling to distribute the load. I get a bind on the root, then cut under it with a double bit ax. Or, for fence posts, I get a bind on them and then hit them with a hammer to vibrate them. The combination of load and vibration brakes out steel fence posts pretty easily if they are only driven, not cemented.