We used Wegoshop.com for our trip to the Beach Club Villas 2 weeks ago. I had read many good reviews of their service here on the DIS. They will deliver just about anything you want, including "Adult" beverages, which many of the other services will not. You confirm delivery time with them, and they guarantee you a 15 minute before and after window. They will shop where you ask them to, there is a drop down list of available grocery stores in the area on their web site.
I ordered national brands of things, and they delivered what I asked for. They were basically on time. Their delivery charge was $19 (Plus tip), but we definitely saved that over buying just water in the Beach Club Marketplace.
We were on the Dining Plan, are not big breakfast eaters, and in the World during the Food and Wine festival. Juice and coffee is all we need in the morning. We were looking primarily for beverages and snacks, and a birthday cake for my DS.
We ordered 2 kinds of juice, coffee, soda, water, beer, wine, cheese, crackers, peanuts, and a birthday cake etc.
We were pleased, and I will use them again on our April trip with DS and his family.
Ask if you have any questions.