The Echo seems to be on everyone's mind lately and I wonder if this bit might be that "last mile" to creating a happier user:

Amazon has done a great job at keeping users informed of what it is adding every week, both through the app and via email. This not only gets you to try new things but gives you the clear feeling that your investment has been worthwhile.

Compared to the opaque communications from both Apple and Google about the development of Siri and Now, respectively, I would feel more satisfied with Amazon's efforts just knowing that there is a development plan at all.