I've played squash in KSOs for about 5 months. I think they are great re: performance, they are light and the grippiest shoe I've worn. AND they force you to stay on your toes...which is a great habit to get in to. I am sure I play better/quicker in them. I still use them very often and would recommend it, BUT...
1. They take a beating. Within a few games some seams were coming apart. They still hold up, but at this pace I'll need another set before christmas (which is expensive!)
2. Toe blisters (as mentioned). I developed some pretty serious calluses so this isn't an issue anymore, it was a problem when I started with them.
3. I bashed my heel so often when I began the transition...my leg and back took a beating. This took some getting used too (i.e. staying on your toes!). I think this issue is inherent to getting rid of a conventional sneaker.
4. I can't play in a shoe with a heel now, it feels entirely different. I am sure I would adjust, but I've been brainwashed by the barefooters... and it limits the options now that I have seen the other side.
As I said, I love them and would recommend. But basketball could be tough. In that case I'd try and find a solid zero-drop shoe (sorry no recommendations, but I'd love to hear some)
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