We used Garden Grocer too and we were happy with them. We will be ordering with them again when we go in September.
The didn't call us to confirm the order or delivery but as we only have international phone numbers they obviously didn't want to call internationally. We ended up being delayed by a day, due to plane cancellations around the USA so were rerouted around the country when we arrived in LA from Australia to make it to Orlando, but we arrived a day late (so lost a day of our holiday and ended up doing a 45 hours straight travel time from leaving home to arriving at WDW, we were exhausted). I had booked the grocery delivery time in the window around our arrival time, but then we were delayed. They still delivered and Bell Services stored the groceries, even the things needing to be in the fridge. Our groceries were in perfect condition after being neglected by us for a day, but they came up with our luggage so it was great.