I still see btrfs as years behind zfs as measured strictly by maturity (not features), and therefore consider it to be at least a few years away from being usab

I still see btrfs as years behind zfs as measured strictly by maturity (not features), and therefore consider it to be at least a few years away from being usable in situations where an advanced file system really matters (mission critical databases, 30+TB file systems, etc.) ZFS has been around 4-5 years, yet in the last few months we hit a severe data loss bug (ZIL corruption) and a service affecting ZFS cache performance bug (ARC cache maintenance routine with math error). I'd assume that btrfs will have similar teething pains.