Echoing this about Amazon Fresh. I have ordered 3 times (mainly meat and veggies) and it's been flawless. Their packaging is great, the quality of the food is great. It is a luxury purchase but although the prices are more than at my local store, they are less than what I would pay at WF. Most importantly, the delivery times are very flexible and easy to arrange...with the same great search engine amazon uses for everything else. I tried a few other grocery delivery services over the years and they couldn't promise any delivery window, their packaging was terrible, and you had to be there in person to get the groceries.
As an aside, the amazon fresh packaging is great as trash bags. The ice packages they send along are great to put in your freezer and use later on trips. They recently (at least to me) added a durable cloth-based cooler, which they say you can put on your porch and they will reuse. I may let them have it back or I might use it as a cooler for my normal grocery store trips.
It is slightly more expensive, but the bottom line is that in the middle of the week I am just too worn out to go to the store, so being able to have a mid or end week delivery means that I have stuff at home instead of having to order out.
I guess I qualify as an amazon fanboy ;-)
Relevance to this HN story, I think they can probably leverage this to help their Amazon Fresh business.