I have moderately flat feet and use these as my indoor/treadmill shoes.  I use a pair of Brooks Beast on the road for the extra support at the cost of it being a heavier shoe.

Per Runner's Studio, I've logged 425 miles on this pair so far.  Looking at the tread, they have maybe another 200-ish miles of life left.  Besides a bit of discoloration from sweat on the white 'mesh' part of the upper shoe, and the tread-wear, they are essentially still in new condition.  Obviously this is helped by my using them as being primarily an indoor shoe, but still that's pretty good mileage for me as I tend to be pretty hard on shoes.

Based on my limited sample (1 pair), these run maybe 1/4 to 1/2 size small, but stretch without damaging to 'normal' size quickly and painlessly.

For people needing a bit of extra support and willing to pay a bit of a weight price, I'd fully recommend these.