I can't believe how many people don't like the Mark III's! The Black Caddi's are the most comfortable thing I've had on my feet in a long time. I personly don't like the WWB. They are too warm and not near enough support for marches. As far as socks, it's all personal preference. I love the issue grey wools for day to day use, and for marches I put on the black/green sock system. Haven't had a single blister yet. Breaking in my boots I just wore them a lot, making sure I switched them every day. A lot of guys I know had a favorite pair, and now when they wear the other pair they are paying for it. One thing I found is the boots tend to stretch after a while, so if they are bit tight I wouldn't worry about it too much.