I was skeptical at first. These shoes look pretty goofy and cost a lot of $. The first time I saw them in person was on Karl's feet after he won Massanutten this May. I decided to order a pair and give them a try. They have become my goto shoe for everything. Roads, Super Rocky trails, fireroads and everything in between. I even wear them on the treadmill from time to time. I wore them at Mountain Masochist last weekend and put down a 39 minute PR. My legs felt pretty good at the end of the race and I think the shoes made a big difference, especially on the downs. I have 350 miles on my current pair and they still feel good and cushy. I certainly will get 500 out of them, maybe more.
I only had one issue with them at first. The toe box is to shallow for me, this is a common issue I have with shoes. I took out the insoles and they work perfect. They are not great traction wise on wet rocks and dry leaves, but the advantages far outweigh these cons. Maybe the trail version would do better?
Dont be afraid to try a pair. The price is high, but the mileage you get out of them brings them in line with other popular shoes.