Brilliant thing to have done. We pre ordered in the UK and it was delivered the day we arrived all ready to go! First class service and brilliant. Cost very reasonable.
I would recommend to peers, though I think the next time we visit Orlando we may not use the service again ourselves. It was certainly convenient, and the food selection was good, but the cost was pretty high especially once delivery is added. I realize there are not a lot of other grocery options if you are coming to Disney (as we did) and do not have a car to go out and get groceries, so I respect that, but we will probably pack our own food or make other arrangements in the future.
Incredibly easy and convenient to use. Made our Disney trip easier!