Quite good for their price. They are a bit warm and maybe in mid-summer the foot may not breathe satisfactorily. However, from Autumn to Spring, they are fine. They provide relative support to the arch and are comfortable. I don't know if it's worth going for triple the price that some have, and which surely won't be much better.

I have had them for almost 2 months. But in practice, I wore them for a week, 14 hours continuously every day. The boot was comfortable, and I had support in the arch (that was the reason I bought them). It felt like I was wearing athletic shoes. Now, how much longer they will last remains to be seen