That thing looks an awful lot like a quad bike with two extra wheels.
Don't get me wrong, I love my fellow kinematically-complicated meatbags but I do kind of think wheels win this round.
The other kind of "extreme off-road differential steered" ATV that people both want (and then seemingly want to sell soon after - almost like a boat) is the Russian Sherp:
I'd love to have one of those - but they are a bit out of my budget (and my wife would probably divorce me if I brought one home, even if I could afford it).
BD has a long term vision for robotics and I'm not suggesting that they should stop working towards that. Just making the point that it's possible to create robust solutions using simpler robotics even in complex environments.