After my very first wearing, I can say these boots are very comfortable.  I walked a little over a mile today in the slush and actually forgot I was wearing them.  I came home with my feet dry and un-cramped.  I was a little scared about the calf size after reading the other reviews, but I had no problem with the fit.  (For the record, I ordered a size 11 and the circumference inside the top is about 14 1/2 inches.)  I really like these so I hope they last a long time.