This is my favorite pair of boots.  They are very comfortable to wear for long periods of time.  I routinely wear them 10+ hours and have never had a blister or had my feet feel sore at the end of the day.  The heel is nice and wide so it is a very stable boot too.  I have a large, somewhat wide foot (usually women's 11) and a wide calf (18 inch) and it fit perfectly.  I do recommend measuring the widest part of your calf and longest part of your foot to get the right size.  Their size chart is not "typical" sizing (at least not in the US).  I ordered a size 12 per their sizing chart and it was a perfect fit.  I will say that the shaft of this boot will not stretch much over an 18" calf though.