The rear of the case is pretty much what we’re used to at this point—a hard plastic shell—but we appreciate how protective this one is, with nicely molded openings for the buttons and ports, along with full coverage otherwise. Missing, however, is a hole on the back of the case for the iPad mini with Retina display’s second microphone, a potential issue for second-gen iPad mini users that won’t bother first-yen users at all. The shell…