I was wondering if any of you has experience with cases with respect to the potential to scratch. I realize it's the dust, not the plastic, that actual does the scratching. I like to change cases for specific uses, so want a protective case that is really easy to put on and take off. So I was thinking of a slider for this use. Like the Incipio Edge Pro (black is in stock, by the way). Or a Candyshell grip, as a potential snap on. So does a slider have more scratch potential than a snap on? Thanks.