I ordered the Amazon Echo for this - which will ship sometime in the next century. But this now makes it obsolete.
I did eventually get mine back in February or so. The add to shopping list feature is very convenient. I don't see this obsoleting that Echo function which is much more general purpose. (Can add anything whether you get it from Amazon or somewhere else.)
https://news.ycombinator.com/item?id=9297279
Let's merge these two threads together and see which wins!