The iSight cameras are now PCIe rather than USB, and no drivers exist for them yet as far as I'm aware. There is some more information on the kernel.org bug tracker[1], and there's also an ongoing attempt to reverse engineer one on GitHub[2].

[1]https://bugzilla.kernel.org/show_bug.cgi?id=71131

[2]https://github.com/patjak/bcwc_pcie

Thanks for sharing, I will add a section about the webcam.

how is battery life and how does it compare to macos?

The battery life is perfect for me. It's hard to compare to macos because I don't use it ^^

How is the stability of wifi?

Everything works very well. The stability is perfect.