Heavy Amazon user here (for 99% of my non-fresh food purchases, I order it on Amazon). This looks neat at first glance, because I order things on Amazon all the time, and I like saving money. A few things that prevent me from using it right now:

- Trust. Is this service legal? Will Amazon get upset at me for using it? Maybe I'm worrying for nothing, but addressing those questions directly on your website would be worthy.

- Order history. Using Zinc means orders won't show up in my Amazon order history, right? I like having all my Amazon orders tied to my Amazon account.

- No one click purchase integration. I haven't used Amazon's "shopping cart" flow in forever.