Very nice - best yet
I reallly like these boots. I wear a 13 and these are perfect for my foot with a mid weight wool sock. Waterproof boot that has great traction even when walking through streams and slick rock.
I would rate these MUCH higher than my previous boots which included the Salewa Mtn Trainer GTX and the Asolo Fugitive. I stand 6'4" and 245#. The Salewa Mtn Trainers were wayyy too stiff with even a 60# pack on. The Fugitives were about a 1/2 size smaller on my right foot and my toe would hit. These are more comfortable than both and fit perfectly. I needed a superfeet green insole for the Salewa's to feel right, but the 520's fit perfect from the factory.
Great support, great traction, perfect stiffness/flexibility, and all around ideal for me. I do frequent long hikes, trail blazing/maintaining, and have a lot of weight carried around. I haven't gone more than 100 miles yet, but in the north east, I can't ask for more.