I love zfs. Started using it for my data storage pool and now I have it on root as well. It has some rough edges but overall it is very stable and has amazing features.
ZFS is amazing but i wish it's support for flash was better. I'm not sure if ZFS will ever be able to fully utilize flash since ZFS was designed around spinning disks and the pitfalls they provide. Maybe at some point F2FS will catch on...