Not the most durable
I wore these shoes on the portion of my Appalachian Trail thru-hike from Pearisburg, VA, to Port Clinton, PA -- 582 miles. As always, I substituted the insoles with a set of Superfeet to add extra support while carrying a heavy pack. Although the sleek design made me feel more athletic, these shoes wore out pretty quickly compared to my Merrell hiking shoes. What did them in finally was a hole on the side of the shoe. They felt great, but make sure you know your European shoe size -- these run a little small. (I cannot speak to these shoes' effectiveness in trail running, however...) Overall, recommended if you want something extremely lightweight, you don't expect them to last forever, and you don't need ankle support.
In the picture, you can see the dental floss holding together my Fireblade until I got into the next town to replace the shoes.