I thought of making fun of "bloody ankles", until I bought my second pair of 846's.  I had no problems with the first pair and figured "bloody ankles" had bought a too small pair of shoes.  I wore my first pair for 6 months before replacement.  On the first wear of the second pair, about 3 miles into my walk, I became acutely aware of the crevice wearing on the Achilles tendons of both feet.  It was pretty painful and took about ten days to heal.  I chalked it up to the shoes being new, wore different shoes for the next ten days, and rigged some padding on the offending areas of the 846's with packing tape and cotton.  I wore my newly padded shoes for about a month and a half without further incident until two days ago.  I took my "jerry-rigged" padding off one of my shoes, figuring they would be broken in after over 100 miles of walking.  Nope, same crevice, same "bloody ankles".  Here's to hoping someone at New Balance is reading these reviews and makes a design change for the next model.  Package tape and cotton reapplied until replacements can be purchased.