"So this is my second attempt at wearing these out. The first time I had them on for no more than 30 min- I got the worst blisters on my heels and literally could barely even stand. Luckily I was at the airport and had a spare shoe to change into in my carry-on. Seeing that you aren't able to return the shoe after wearing, I attempted to break them in in by wearing them around my apartment. I noticed some improvement so I decided to try to wear them out again. This time was a little more successful. I had to walk about a mile and by the end I had to pick up bandaids because my heels started bleeding some.
So my advice to you, if you buy them, but a box of bandaids to go with them. They seem to be somewhat loosening up but I don't think I'll wear them again without heel protection."