I have used this service two different times on a long vacation in Orlando - it was awesome. Both times we arrived and our food was there before us and it was so nice not to have to go shopping. Also much better than spending $2 -3 for a bottle of water every time you turn around.
I really can't think of any suggestions for improvement because I can't imagine it getting any easier.
Awesome service you provide! Groceries were perfectly delivered, much appreciated!