I think 2017 is the year of the Clifton 3 but like all long term runners (i.e. Fashion is not a factor when buying) I picked up a few pairs of the Clifton 2’s back in August.
You can see the difference between the pair I am retiring (throwing out) and pulling out of the box. I think the worms out pair have been on the go since July but August and September were low mileage months.
This model of shoe is pretty minimal and the sole wears out like a kid dragging a block of aero board across a pebble dashed wall.