A quick look shows that the savings on the customer end aren't very good, not even comparable to a good discount store, or even buying in very large bulk amounts. And from reading some of the posts, it looks like super saver shipping doesn't apply, which is the only thing that would make it worth it.

In my head, I was picturing an old school sort of "drive through" grocery, because I don't think there's really a way to make the delivery of goods that need to be cold/ fresh both affordable and timely. Never tried Amazon fresh, and have never lived in Seattle. Might be worth looking into how they do business.