For what it's worth -
I'm running MooseFS Pro at home (150TiB licence, 1.3PB cluster) and at work (1.5PB licence, 1.8PB cluster) and the erasure coding and high availability is solidly in "just ****ing works" territory. Failover is reliable. I sleep better with it than I do with my Ceph cluster.
Not only that, it actually *works* (read: provides reasonable, usable performance) on hard drive bricks/OSDs/disks, unlike Ceph... My 2c.
There's tons of development on Moose, it just isn't trickling down yet as MooseFS CE 4.x isn't a thing and won't be until... something? happens. I'm unclear on when they'll actually open source MFS4, but in the meantime it's by far the best SDS I've used. Happy customer.