I've now been using the all-mountain helmet for almost a season in all weathers and am thoroughly satisfied. The Four AMID has mostly accompanied me on my tours. I also have a second helmet, which looks more robust and is too heavy and bulky for ski touring.
The Four AMID , on the other hand, is nice and light and can be easily stowed away in the helmet net, thanks to its non-rigid ear pads. At the same time, it feels like a real helmet that can withstand a lot in an emergency. I think that a helmet that you lug up the mountain (which I always do, by the way) should also fulfill its purpose when you need it. Atomic relies on its own "Atomic Multi-directional Impact Technology", which, according to the Atomic website, guarantees 40% more impact protection than the industry standard. I trust in it 😉