I wear the A5s for tempo runs, intervals, racing, and sometimes daily runs. I probably have around 100-150+miles in them and they've held up fine. I don't wear any socks with them and find them really comfortable.
The problem I have with them is those stupid drainage holes in the bottom of the shoe. I didn't really think too much about them, BUT
(1) all sorts of rocks get lodged in them so you have to pry them out unless you want to run in a flat full of rocks
(2) if you step in a puddle, you best believe that water is coming up into your shoe.
But, even with those complaints. I like them and find them to be pretty durable.