ZfsOnLinux production quality?

I've been running ZFS on FreeBSD and SmartOS for many years. I love ZFS and would never go back. I heard rumors that ZfsOnLinux is still not production quality and has some drawback compared to the versions of FreeBSD and SmartOS. Does anyone run ZfsOnLinux in a production environment for a longer time? Would you recommend using ZfsOnLinux for production purposes?

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