We ordered from there and can't complain one tiny bit! They are very reliable and you don't have to be there to get your order, they will leave it with the front desk and in turn they will put everything in the fridge that needs it.
GG picks out everything that you order, and if you have special brand requests they will go and get that for you as well.
We brought our own soft sided rolling cooler, we folded it flat and put it in the bottom of our suitcase and packed on top of it. The things we ordered were breakfast cereal, fruit, bread, peanut butter, milk, case of water, snack crackers, and Mt. Dew for hubby. (No pepsi products in WDW) I did however take our own plastic knife, spoons and bowls, the bowls you can get for a dollar for four bowls at Wal-Mart and the plastic wear you can get any where, we have lots from Party City from all the birthday party's we have here at home (very durable), this way I could throw these things away and not feel bad at the end of the trip.
The ice is free as I'm sure it is every where (we stay at the value resorts) so we would fill up every evening before bed and then again before leaving for the day. It kept everything cold and the fact that the cooler rolled made it very easy to rid the water and get new ice without having to lift or make lots of trips with the ice bucket to fill the cooler. It saved us tons of money not having to eat breakfast in the parks, and saved us from having to use our
ddp snack credits for water.
Having the water and sodas cold in our back packs/bags when we would leave for the parks made for keeping us cool longer as the day went on, we also would fill up with ice and cool water (with the bottles we would take in) as needed in the park where ever they served it since they can't deny you this.
I think you'll be very pleased.