I wrote a brief review of Garden Grocer here: http://www.lovelogicandlaughter.com/2014/06/disney-tips-and-tricks-disney-world.html
We have used Garden Grocer on several trips to Disney World. Their service is always impeccable and their website it easy to use. They checked to see that our order was placed, delivered and correct. We ordered 40 dollars or so worth of drinks, breakfast food and snacks. Perfect for our family of 5 and a 6 day trip!
We love Garden Grocer! We have used them the 3 times we have been to Disney. The website is user friendly and the food arrives right on schedule! We can't wait to use them again for our next trip!