So far so good
I ordered a pair of size 12, but they were really tight, so I used the free return and ordered a size 13 instead. This fits closer to what most 12s fit on me.
I like the fit and the shoes are very comfortable. I wore them around the house and often forgot I had them on. I'm still getting used to walking in them. The soles are quite thin and flexible, which gives a feeling closer to not having shoes on.
They have so far kept my feet warm on a cool, rainy winter day, and I have washed off the soles without fear of getting the wool wet.
Time will tell if having no arch support will be better for me or worse, but I like the idea of a more natural stride with the thin, flexible sole. My only other concern is how quickly this flexible sole will wear out.