I've retired two pair of these at 550 miles each and have another two pair at just over 450.  These were my marathon shoes for 2012 and I ran a sub-3:30 in them before I switched to Kinvaras as my primary running shoe.  While I like these, I doubt I'll use Mirages for any racing anymore.

The Mirage is kind of a gateway shoe - it introduces people who are used to heavy trainers to the world of lightweight shoes, but once this shoe helped me break my dependence on heavy shoes with stability features, I wanted to go further down that path and switched to Kinvaras.  While I continue to rotate in the Mirages from time to time, I find I use them less and less - they feel stiff and numb compared to the Kinvaras.  But they're just the thing to work your way down from heavy shoes to light ones.

Also, the Mirage has a somewhat restrictive toebox, especially compared to most lightweight shoes.  My Kinvaras, Peregrines (both Saucony) and Wave Elixirs (Mizuno) all have much more spacious toeboxes.  The tight toebox on these has cost me a couple toenails that I probably wouldn't have lost if I'd been wearing any of my other shoes.