[glass-]

Also see, Ted Unangst's post about ZFS where he lists some criticisms[0] which somewhat expands on Brauer's criticism, and he talks about when he was interviewed on BSD Now[1].

Keep in mind that their criticisms are mostly about it not being a good choice for OpenBSD, although some of them apply across the board.

[0] http://www.tedunangst.com/flak/post/ZFS-on-OpenBSD

[1] http://www.bsdnow.tv/episodes/2014_02_05-time_signatures