Finally, a safe topic that everyone will agree on. What could possibly go wrong?

Keep in mind the armors used in those videos might not be representative of actuality, especially the organic armors because they aren't Tod's specialty. The gambeson especially is too thin and using worse quality than what would have been used historically. I don't think many sling stones or bullets will do too much damage through a well made gambeson. I feel like most well made armors would dissipate much of the force of a sling stone or bullet, even if they did get dented. I feel like hardened leather would be the exception, as I'm not sure how good it is at absorbing impacts.
As we all know, aim for the head. Even if they have a helmet, you still might be able to ruin someone's day (or life).
But, I think we definitely need testing.
We'll have to have someone wear the armor. Don't worry, you'll probably be safe. Probably. Any volunteers?