I wonder how much that thing weighs? The traction was surprisingly good even when pushing a full plow's worth of snow. My guess is that there's a fair weight of SLA batteries in the belly of that beast.
That thing is awesome, I didn't think it would work when I first saw it, but it does really good.
I just saw this morning that people that live in D.C. have to shovel the sidewalk in front of their house or pay a 25 dollar fine, businesses would have to pay $250. You could make a killing with a thing like this.