I am sorry for those who don't believe him, but I got my S7 (non-edge) on March 11, 2016. I was sitting on my bed, reading a book, my phone just on the side of the bed besides me. It moved and the phone felt. Less than to feet high. My floors are clear and they are made of soft wood. The glass cracked from the home button (center top of it) to the right middle of the phone where the frame is. Really, as much as we can see those drop test, I still cannot believe that mine just broke this easy. I have had all the S series, aside from the S6 (bc no external SD). This happened on the 16th of March. However, the crack was not "outside". So I cannot feel it when I swipe. But the more the technology is advancing "gorilla 4 yeah right", the more they should be durable and not the opposite way around. I ended up having to send the phone to a Samsung authorized service center (took 16 weeks to come back). $163 CDN (I live in Canada). Unfortunately, I live in Ottawa (the Canadian capital = 4th biggest city in all Canada) and Samsung only have a service center near Toronto (not even Montreal which is the second biggest city in Canada).
So yes, its not only with the Edge, Gorilla glass 4 are weak. I never had any cases on any of my S1 (2), S2 (1), S3(2), S4(1) and S5(3)... They never had any issues asides from the S4. The best of all was the S2 where the frame was way higher than the screen.
I don't understand why one would need to put a tempered glass... to protect the one of a $900 CDN phone... I can understand a case since I can be ruff sometimes (boating, etc.).
I am an android forever, put put this in context: Appel has apple stores everywhere in Canada, and they change your glass while you are taking a coffee and its $90 CDN to replace.