I've had neither the 5s leather case or the 6 leather case (because I haven't gotten my 6 yet). But I'm leaning towards leather over the silicone. It sounds like the 6 and 6+ cases have a firmer, smoother leather, less porous, maybe less prone to attracting dirt or wear? Or what do you think they're trying to accomplish by changing the material slightly? Is it a downgrade or an improvement do you think?