I love this service! The groceries were waiting for us at our vacation home when we arrived and we were able to dig right in and cook our dinner! Just awesome!
My sister located this service while we researched our Disney vacation plans. We had a large party (11) travelling and needed to ensure we had essentials in our room or for use at the park. The system is organized and our items were delivered before our arrival with an email confirmation of delivery.
I do not think any type of improvements need to be made. Was super easy and it appears you have perfected your service :)