Have used several cases before settling on a clear frosted Capdase for my white 1520.3.
Screen issues aside, I knew I needed a case when buckling my seatbelt caused the belt to wrap across the phone. After adjusting the phone in my pocket, I realized the high pressure being placed on the phone.
Didn't want bend damage to phone (Bendgate v1520.3 lol) so acquired cases to stiffen chassis.