ok i thought we pretty much confirmed it is Gorilla Glass and Corning also confirms this. Now of course even GG is still GLASS!!! it is tougher but far from indestructible. Clearly the many iphones and other confirmed GG smartphones i have repaired for clients is proof of this lol. In fact my brother in law has broken his screen probably about 4 times! then again he is in border patrol and in the field so pretty rugged environment. Anyways it is tough but still extra protection never hurts especially when screen protectors are cheap cheap cheap! and cases well you can get cheap and relatively expensive that is up to you. I personally always use a screen protector, and a hybrid silicone and plastic case. Cheap insurance for an expensive piece of hardware that I rely on daily. But as always to each their own.