I gave up using them on my Moto Defy which has Gorilla glass and sure enough within a few weeks of careful use I could see little marks on the screen where it had probably rubbed agains a key in a poket. I was always very careful but clearly Gorilla glass scratches quite easily under the right (or wrong?) conditions.
I then used a flip case and that means no screen protector required and just the slight annoyance of the flip case when answering or using the phone.
I then used a flip case and that means no screen protector required and just the slight annoyance of the flip case when answering or using the phone.



