Which 3G and 4G Networks Are Fastest (in the U.S.)?

PCWorld recently surveyed mobile broadband speeds across 13 major U.S. cities. It was a bit surprising to see how respectable both the 3G and 4G networks performed, with downloads running up to 9 Mbps. Of course, performance varies greatly depending on location and choice of provider. One carrier in particular gets low mark here. Even worse, though, coverage areas can be limited. People outside U.S. metropolitan areas often can't get anything close to the numbers quoted in this survey from these "nationwide" services. Does your mobile connection perform to the level PCWorld saw?
→ More - 3G and 4G Wireless Speed Showdown: Which Networks Are Fastest? (pcworld.com)