ABS is great above treeline
I see alot of people stateside looking at air bag systems. Remember all these avi tools are for worst case scenarios. Also air bag systems are good if you are above treeline or in open bowls with good runouts and not in tight shoots with drops below otherwise your off a cliff. I still feel in North America a beacon, probe, shovel and brain are your best backup for worst case scenarios. Choosing your terrain wisely and educating yourself is the best option before heading out.