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Are there any users who have tested it or already use it in production environment ?
If so please give us your feedback.
The ZFS support is only available for the -CURRENT branch at the moment, which is unstable, state of the art and NOT recommended for production use. I don't think ZFS will be backported to the 6.x branch, so we'll have to wait for the 7.0 release.
Nobody with a sane mind would be using a new ported filesystem in a production environment.