Have you been putting btrfs through it's paces at all? Kind of living on the edge - the VSIDO way; last I checked Debian considered t unstable for production, but the user base seems to like it for data volumes. Apparently has a lot of features that LVM provides in addition to the btrfs snapshots.
The partition I use for an NFS share is btrfs, but that's as far as I've gone. Been stable for me.