When I went out to a nice dinner, I've tried it a couple of hours without a case, and I really like it. It's smaller, thinner, and definitely cooler looking, especially in public. 😉
But I've heard stories about microscratches that end up all over the glass, let alone real scratches that can happen with or without hitting other objects like keys, coins, belt buckle, zipper, or whatever.
I had the Invisible Shield, but the corners always lift after a while and it gets really dirty and ugly.
It's because of that that I'll reluctantly return to a case.