Personally, I wouldn't trust it for actual production yet, Kent does claim it is. I'd want it mainlined before deploying it on my servers.
But also by experience, bcachefs is incredibly stable. The only issues I had was when mismatching the tools and the kernel, leading to fsck being confused when outdated compared to the kernel. But even with that, I haven never lost any data or had it even as much as hiccup.
Good to know.