I mean I have had them over 2 years at this point in rotation and they have held up the worst out of any of my other shoes that are much older and some much cheaper. They all get the same care and attention. I always felt that they felt pretty fragile, and light. It is hard not to attribute the wear to the thinness of the leathers they use.
It is clear they are going for the French/Italian vibe more than the robust English shoe thing. They are beautiful, but I don't think there is going to be many openings in my shoe rotation for another pair. Uppers cracking is a large reason why I am hesitant to go bespoke with shoes. Sure a better fit may lead to reduced stress on the uppers, but I have had so many well cared for shoes end up cracking I have a hard time justifying paying 4x + the amount to see their same demise. I am not a bigtimer like that.
Do not try the Berlutis if you think the Corthay's are fragile...
Of the high end French brands Corthay stacks up as a fairly robust offering. They aren't as durable as some English brands, but they should last at least a decade. Pierre Corthay likes to say that if cared for and worn every fortnight his shoes could last twenty years easily. I can't see any of the 4 models I have lasting more than fifteen years.