The Samsung Galaxy S8 Plus, front what I've read, comes with Gorilla Glass 5 on the front and back. What I didn't expect to see is that the rear glass shatters when dropped from around 3 feet (waist height). I thought that the GG5 can survive most of the time when dropped from a shoulder height, but in the case of the S8+, it was shattered on the first try when EverythingApplePro tested it, here.. check out his video below.
As you can see in the video, the Galaxy S8+ back glass shattered on the first drop test. The iPhone 7 Plus survived because it doesn't have a glass back, but a metal one. This is very disappointing results and I think not that such a good PR for Gorilla Glass. This is the latest Galaxy device, featuring the latest tech and the latest version of Corning's hardened glass so how come it performed so poorly. I start to wonder whether it is Gorilla Glass 5 after all. Of course the only thing to do is to check out the official samsung.com website and see whether it is indeed GG5 on the back.
According to the official samsung.com website, the Galaxy S8 and S8+ indeed have a Corning Gorilla Glass 5 on both sides, an I quote: "Corning Gorilla Glass 5 on both the front and back for durability..". So there you go, the back is using a Gorilla Glass 5. Maybe the good news is that the front side did survive some drops without any shattering.
Of course many people will use a protective case to protect there phone from damage, at least that's what I do. I really don't want to see my Galaxy S8 glass damaged and send it to repair in case I accidentally drop it. You can see that you don't need to hold the phone in the same level as you face to break it, the rear glass can break by just dropping it from waste height. This is kind of disappointing and I think it's important to bring this disadvantage up, although it's not a deal-breaker in no way in my opinion.