Unless if the mech and frame are strong enough to take the hit (which they claim they are), then all you've got now is a bent hanger you need to change which you wouldn't have needed to do, IF they are strong enough as they claim...
I've broken a couple of hangers by getting a stick or something caught between the chain and the lower pulley wheel. I wonder what will happen with these, looks like the cage is supposed to give and it seems to be easy to replace.
Yeah, that's the whole point.