I am a soldier in the US Army, 1-28 Infantry 4thIBCT. I bought a pair of these boot while in Garrison over a year ago and have worn them in Iraq for 6 mounths. From the day I put them on I have sworn by them. In garrison my unit Ruck Marches a minimum of 12 miles with 50+ lbs. rucks every thursday, no matter the weather sleet,snow,sun or rain. I have never had a blister one! I also rolled my ankles a lot in the "issued" boots and have never done it again since I started wearing these Blackhawks. I love them. Several of my buddies bought them after me and loved them also. If there was a negitive about them it would be that they are a bit hot, and no venting. The other negitive would be that They were made with a sort of rubberized material around the front and heel portion that was wearing out on some of them (not mine) BUT The pair I just received hear in Iraq are not made like that they made those two areas with leather now. I'm sure it was do to some complaints. So Problem solved! I shattered my left foot a few years back and even have pain in most running shoes, I rarley have any foot pain at all while wearing these Blackhawks. If I was going to give a low estimation on how far I've worn them it would be 800+ miles. I bought the new ones so I will have a clean pair to go home in.