An overwhelming majority of iPhone 4S owners are “very satisfied” with their new Apple device, and in particular, of the onboard Siri Digital Assistant. According to a new survey released by ChangeWave Research, 77 percent of iPhone 4S owners reported being "very satisfied" with their purchases, with Siri at the top of the list of most-enjoyed features. The survey also showed that customer satisfaction ratings for the latest Apple iPhone are higher than that of its predecessor, the iPhone 4. And to say that the 4S was only a lateral step for new Apple tech? Apparently the majority of people don't think so.