I've had these boots for about two years and have worn them a handful of times.  I take a size 10 shoe, and found that the 10 boots are about 1/2 size larger.  The larger size is appropriate for a boot, considering that thick socks can be worn, and your feet will stay warmer if there is some space between the tip of your toes to the tip of the boot.  This extra space is actually recommended by experienced hikers.  I've had no problems with blisters due to the space, and my calves are smaller, so no problems there.  It was quite awkward driving in them at first because of the width and thick rubber soles, but I got used to it after a couple of trips.  They look great in the olive green, which looks more like a classic darker brown leather.  The zipper is very sturdy.  The high quality is apparent and I have received many compliments.  I also own the brown Sorel Cate the Great and black Joan of Arctic boots.  I love them all!