Amazon Grocery?

So Amazon sells grocery store items now. I was skeptical at first, but this looks to be both a time saver and money saver, if you know how to shop. I think the free shipping on the Subscribe and Save program is what really changed my mind:

"When you order through our Subscribe & Save program,
you'll:
• automatically receive a new shipment of the item in intervals you select--every one, two, three, or six months
• get a discount on our everyday price
• get free shipping on every Subscribe & Save shipment
• pay for each order only when the item is shipped
• have the option to cancel at any time "

This is straight from Amazon. It seems that if you look around for good deals, and know the relative price of similar products at your local grocery store (ahem, walmart), that you may end up saving quite a bit. Also it gives you more time to review your purchases, and you can set up automatic delivery each month. I may just give it a try and let everyone know how it goes.