The latest version of Apple’s streaming media set-top box, expected to hit U.S. retail stores on Friday, has gathered a bundle of mixed early reviews. Some reviewers saw great potential in the $149 diminutive black box designed to pump movies, TV shows, games and apps from the Internet to a television set. Others found plenty to criticize. “Functionally, it’s the biggest change we’ve seen to Apple TV since its introduction,” Ross Rubin, principal analyst with Reticle Research.