Mine is only a month or two old, but it's been incredibly hardy. I've picked up a couple of scratches on the edges and base when people have bumped into me, but the front looks spotless. Scratches are fairly discreet and look more like a raised bump, rather than a deep gouge. Although quite stiff, I think the leather is also quite 'rubbery' so has been quite forgiving.
It's also been great in the London rain so far, not showing any markings and drops evaporating quickly when you don't get a chance to wipe them off first.
After a few weeks the leather has already softened somewhat too. It's still incredibly structured, but not stiff.