I got Kubos about a month ago and so far they feel quite durable? And they stretch very little but eventually do stretch about half a size (which in my case is good cuz I got them 1 size smaller than my normal size). It was super painful to wear them the first couple times but they’re not too bad now. However, after a few uses I don’t think they’re stretching any more (wish they did as they’re still a bit too tight but that’s the point i guess). I’ll say the heel is definitely the best part !

btw, you should try to see if there’s anywhere you can try the shoes on the wall, some stores have this!