I purchased these to utilize during my Mount Everest Base Camp.  Against others warnings, I wore them "cold turkey" aka I didn't break them in before the trek.  Despite my ignorance, these boots still worked perfectly throughout the entire trek.  They were super comfortable, didn't rub, and I never got any blisters.  My only "complaint" would be when I first got them I guess I pulled to hard on the shoe string because one of the top eyelits fell off, but it was easy to replace and never proved to be a problem.  I would highly recommend!!