Even though the study (albeit informal) did not include personal assistant functionality, that's where Google Now (as manifested in an Android phone connected to a google account) really shines, in that like a real personal assistant, it brings you relevant information before you even ask. Around this time last year, I used to be startled by a timely reminder on the home screen widget about the next thing I was about to do (reminder to leave now for a meeting across town scheduled for a half hour from now, or automagic notification about a flight cancellation etc). But by now, I'm so used to this functionality that I feel slightly annoyed if I actually have to ask for such information (which is almost always a voice query to my phone at this point).