I HEARTILY agree with turbochgd's recommendation of the amFilm tempered glass full screen protector. And I am very picky. The link turbochgd posted goes to the exact model I ordered. If you want to check, I am Verified Purchaser on Amazon. I spent many hours doing research and MONTHS looking for a decent glass screen protector for the five S7's I got for myself and my family. I tried over 7-8 different glass screen protectors from Amazon, and none of them worked very well. Some of the "full screen" glass protectors that went all the way to the screen edge either did not adhere properly or immediately cracked when I put on my Speck Candyshell Grip case or the UAG cases I got for the family phones. I finally and reluctantly went with a flat glass protector, which covered the entire visible screen but was not curved, so it left a 1/4 inch "ghosted" band around the perimeter of the protector.
At long last, I came across the amFilm model. I have put on many glass screen protectors in the past, and the amFilm was a breeze to apply. It is FULL screen protection and adheres very well. From what I can tell, it has excellent adhesion along the edges and a unique dot matrix pattern that helps it adhere to the rest of the screen. Once properly applied, it sticks completely flat to the entire face of the S7. The dot matrix pattern either disappears or is not visible when the screen is on. And it works with both the Speck Candyshell Grip and the UAG cases. Touch sensitivity does not seem to be affected at all.
Someone mentioned above that they had a halo in the center. I have applied 5 of these and only got a halo one time, which was actually my fault. I accidentally missed a speck of dust on the screen before I put on the protector, so I had to pull it off and try again. Then a speck of dust landed on the sticky side of the same protector, so I had to pull it off once again! Needless the say, it did not stick very well the third time, so I had to trash it and apply a new one, which worked perfectly. So now I have a system for applying these protectors. I clean the entire screen very carefully, especially around the edges, using the provided wet cleaning wipes. Then I dry and clean the screen with a microfiber cloth. THEN, and very importantly, I cover the phone with a clean microfiber cloth to prevent any dust particles from settling on the screen. I take the protective film off of the screen protector, making sure to hold it with the sticky side face down so no dust particles can settle on it. Then I slide off the microfiber cloth, check again for dust particles, and immediately put on the glass screen protector. Voila! Perfect application.