Let me be clear, I did not get protective glass, now I have jean rivet scratches on the glass. I've never had scratches on my glass prior to this phone. The black leather-like case from Apple is the one I've got on it now, it has provided ample protection from 5 ft drops, no dents or scratches on the back or sides. Just the glass where my jeans hit it.
My wife has protective glass on her 6S Plus, her glass is fine, the protective glass has a crack in it, so it did it's job, and she can still use 3D touch.