It is essentially a transmission clutchpack braking design. Instead of the brakes doing the braking, a controller (brain) regulates pressure in the clutchpacks. That is why they say they have heavy duty clutchpacks and a big cooling system. All that extra clutchpack friction (heat) needs to be addressed somehow. Interesting concept and interesting approach, but unproven in the field so far. Wonder what the cost is to replace/repair a clutchpack or a radiator in this new model. May offset the break wear cost? I guess we'll all see soon enough.