Ipad4 in a ZaggKeys Pro, excellent backlit keyboard, the back of the Zagg matches silver back of iPad, and closes with magnets, so very good protection for screen when closed. Smart Cover when not using the keyboard.
iPad Air, just Smart Cover.
Both have HD screen protectors.
I don't really care if the backs get scratches, I won't be selling them. but I do care about the screens being perfect. While I am careful and the smart covers are protection enough in most ways, I clean the screens every day, and also use stylus, so the screen protectors are mostly for that.