I've personally seen MANY shattered SGS2's and already 1 shattered SGS3.
If you buy a glass front Android device because it's "more durable", you're going to have a bad time. They use the same or similar glass suppliers, and it will break very easily.
If you buy a glass front Android device because it's "more durable", you're going to have a bad time. They use the same or similar glass suppliers, and it will break very easily.