RAID 5 Box

Has anyone ever used a USB RAID 5 box?  I’m thinking of picking up one of these:

By the way, I realize that a reviewer said he’s using the box on his WD player, but I’m just wondering if anyone has had any issues with it or issues with just using a USB attaced Raid 5 box in general.  I tried using a JBOD box, but unbeknownst to me, the WD does not recognize JBOD boxes.