I'm considering a 500 with the red leather interior, it does not have the revised seat cushions with the extra stitching so are the seats liable to sag after a few months? Regardless of the sag issue, to owners who have the red leather, how does it hold up after longterm use? It seems very bright and garish when new so does it calm down a bit and take on a nice worn patina over time? My first impression of the leathers is that they're not great quality and look a little cheap, particularly the brown so just wondering how they hold up.