We are just back from walking the Via Alpina Red Route from Trieste to Oberstdorf (in Europe). 7 weeks continuous walking along mountain ranges and over high passes each day, 8+ weeks in all. Weather from heat waves to snow. More limestone country than you want to know about, and more limestone scree than you could believe. It clatters. I took the 814s as my only shoes.
Near Triglav in Slovenia - it's the highest peak behind us. Serious limestone country.
Very comfortable: did not need to take them off in the evenings. (However, staying in a mountain hut required that they be left at the door. Mud and all that.)
The soles lasted extremely well over all that rock, and gripped extremely well too.
The mesh sides of the shoe suffered some abrasion at the middle of the shoe where there is no upper rand strip. I will try to add a photo of this later. That was the only problem I had, and the abrasion did not affect the performace at all.
I will continue to wear these shoes now I am back in Australia. They are not worn out at all. Long life seems to be a feature.