WE have used Wegoshop.com 5 times in the past and we will be using them again on our upcoming trip. I have been very pleased with the quality of the items and with their service. The cost is the actual cost of the grocery items (no mark up) plus a delivery fee, and of course a tip for the delivery persion., I think the charge was $17 the last trip. We believe we saved that over the cost of shopping on Disney property, and certainly over the cost of a rental car.
I like the fact that I type in my items rather than choosing from a pre-configured list like at Garden Grocer. I name brands and sizes of what I want and I indicate whether I will allow substitutions or not. Marge Peck the owner, even called me from the grocery store to check one time. Wegoshop also gives you a 30 minute delivery window rather than the 2 hour window of Garden Grocer. I think you will find folks here who like each service for different reasons, and I think either would be fine.
We ususally order Breakfast items, juice, coffee, soda, water, beer, wine, fruit, cheese and crackers, and snacks.
Have a Great Trip