[georgyo]

I have been running ZFS on Arch Linux for a little over two years across four drives, and doing weekly updates. Haven't ran into any issues yet.

[Zancarius]

I'm actually surprised by this, but I'd wager that you also didn't use the DKMS AUR packages. I also suspect you wait for the zfs-linux (etc) packages to match the kernel version before updating. Or you manually bump the kernel version and build it, hoping for the best (edgy!).