Another Garden Grocer user here. You pay for the convenience, but it is very convenient when you don't have a car and/or are like me and taking a cab anywhere would be more hassle than it's worth.
I've used them for all 3 trips and each time my order was there when I arrived. Usually I get a text when I'm in line to check in letting me know they've made the drop. It has been correct, usually double bagged and the perishables were fresh. I'll be using them for a 4th time in April.
ETA: Even the time I drove down from home and packed a lot of food, I still ordered perishables from GG.