I bought the black on black, medium, in February 2017. I believe I've spoken about it on TPF before, but it has held up very well.
(This was when the price was around $2210 including tax)
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This is my errand go-to bag, so I use it quite a lot. It is probably one of the oldest and most used bags in my collection and I usually carry it crossbody.
I do not baby my bags. I carry them in the rain, put them on the ground. I've scraped them against doors and doorways. (especially this one tbh, it has gone through thick and thin and come through)
I think at the 5 year point it barely started to have chipping on the YSL logo hardware, and that's just at the corners and it is barely noticeable. I've never had issues with chipping for the chain or the rest of the hardware.
There is corner wear and tear but it is minimal.
The way the leather is treated makes it very durable and hold its structure well. I've had no creases or dents. No issues in the rain or when it gets wet, I just wipe it off.
I remember walking into a Moynat store around 2021 or 2022 and the SA there thought my bag was new. That's how good it looks.
If you like, I can take photos of it when I get home.