I’ve got a very good experience using ZFS. I started using a mirror and later switched over to a Raid Z2 (this involves moving the data away and back) with 4 discs (that’s basically a raid 6). My setup runs stable for almost 4 years now. One time a disk failed, I ordered a new one inserted it, told ZFS to use it and ZFS did the rest. While a pool is degraded it can still be used. What I like most is the ease of use (I think btrfs is not that different here). To check the data consistency one runs a scrub (zpool scrub ). I do that once per month.
Although it is zfsonlinux so far I didn’t have any issues with directly using the documentation from Oracle (e.g. https://docs.oracle.com/cd/E53394_01/html/E54801/gaypw.html#scrolltoc).