The reason I have all these mounts for sale is I when I upgraded my original Mini to a Mini with Retina display, I was tricked into buying the new mount that was supposedly specific to the Retina model (i.e. slightly thicker). I stupidly did the same thing again when I recently bought a Mini 4, which is slimmer. Frankly I cannot tell any difference in any of the Roll'r mounts - I don't really think there is any. Just a marketing gimmick.