Sometimes it looks like people really want to demonize raidz2 in favour of using sets of mirrors when you have 4 or 6 disks. At home I use raidz2 on my machines because I care a bit more about any 2 disks being able to fail rather than it being Russian Roulette after the first disk fails, and I haven't ran into any performance issues whatsoever, even when moving large amounts of data around, installing to multiple VMs on those filesystems or deleting huge amounts of files.

@jlecour I use the zfs-dkms package, and I don't use zfs for /