Cage designed all of the Duff equipment when he worked for them. He went out on his own a few years ago and now designs and sells his own equipment. All of the Duff equipment is a so-called version 1.1 where as the Cage stuff is version 2. Not to mention the Duff prices are a couple hundred more. You get an extra shock on each corner, but that is overkill for an EB. I would recommend going with Cage over Duff.