I bought these boots after my favorite Salomons finally fell apart - problem was that I was about to leave on a two week trek through the Himalayas in a month, and I wasn't sure I'd have enough time to break new boots in sufficiently.
I didn't have to worry, because these boots performed wonderfully with minimal break in time. They weren't bulky or cumbersome and gave me just enough room to wear the dual sock system necessary for the trip. For two weeks I wore only these boots for 7-8 hours per day and over 7 miles of steep trekking. The only blister I got was on an 11hr day of steep descent with few breaks... which was really unavoidable. My feet were perfectly warm in sub-zero temperatures, but definitely required breathing time in the evenings since the insulation of the boots worked so well.
All in all, I absolutely love these boots. The overall comfort and support is excellent, they're relatively lightweight but well constructed, and provide exactly what I require for my outdoor activities around the world.