I've had these Keen boots for several months now.  I wear them 5-6 days a week taking the dogs out for 1.5 hour walk/hike in all weather conditions.  I have wide feet and have always found it hard to find comfortable fitting shoes and boots.  A roomy toebox is prerequisite. These boots were very comfortable from the get-go -- no 'break-in' period.  I've worn them when the temperature has been in the teens -- with rag wool socks -- and my feet didn't get cold.  I've worn them in rain and slush and my feet remained dry.  I really like these boots and would buy them again.  The only complaint I have is that I've already thrashed one of my laces (and need to get another pair).