I have heard about them, but could never see myself doing it. I never understood the point. There is a local service that I AM interested in, though: curbside service. Walmart does it and the grocery store chain that we shop at is starting to do it, too. You order your groceries only, THEY do the shopping for you, you pull up and they load it into your car, FOR FREE! Well, at Walmart it's free, the other store charges $5, but I would gladly pay it! If they would just hop into my car and come home with me and cook it, too!
As a busy mom of 4, I could really use that service. Unfortunately, the grocery store in our town hasn't started it yet, it's just the ones in bigger cities, but I'm sitting here waiting for it, lol.