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The Linux implementations of ZFS are dog slow, and for the last few weeks I've been evaluating btrfs as a possibility for my home storage server, and I've ruled it out completely.

btrfs has been "Close to a stable release" for years now, but if you follow their mailing list there are still people reporting total loss of large filesystems once or twice a week (This week I saw filesystem corruption from an unexpected power outtage, and last week there was a data loss/corruption bug caused by a pool of drives with different sector sizes), I desperately want btrfs to be mature but it's more than a few releases away from being stable.