In reply to Carol Goodall:
To be honest with you Carol,
I've had a pair of the same shoes. They lasted around the same amount of time before the inside around the heel wore through.
I used to wear them for casual and work. they never gave me any problems blister wise on the heel.
Every pair of shoes I have had that i wear casually/ work wear through on the heel inside but his is my fault as i dont tighten the laces as I should.
They never give me blisters or cause pain, I take it as my own problem for not having the shoes tight in the first place.
After all the wear is from friction with your foot moving in the shoe.
Its up to you if this a problem you can live with??