Both shoes caused blisters on the first day.  One shoe fell apart on the second day, which at least stopped the blisters.  So one shoe is currently still quite good, but the other is trash.  Unfortunately, I have two feet.  A close look at the shoe that failed (note: the part going round the heel ripped apart when I was putting it on) suggests that the construction is very shoddy.  Maybe I got a fake, but I bought them from Teva on Amazon, so go figure.  I've not experienced a similar failure in a shoe for as long as I can remember, so only one star.