Even on non-boot drives, ZFS can be a real boon. I used it for a 1U appliance on a solaris machine on two disks, and it saved me the cost of a RAID card.
Right - ZFS is awesome even as a non-boot storage pool. But one of the main drawbacks of MacZFS (the open-source competitor) is that it can't be booted off of, and this product doesn't seem to offer that feature as a competitive advantage.
Presumably this product offers support for the latest zpool version and is based on a much more recent ZFS codebase (and hence should perform better as well), but because their site is so devoid of benchmarks, it's hard to tell.
