I set up sainsburys home delivery for the first time last Tuesday and have to say I'm delighted with it, should have done it ages ago. My concerns were that the fruit and veg wouldn't be up to my own very picky standard, that they would send ridiculous substitutions, and that they would be late.
In the event the fruit and veg was exactly as I would have chosen, I had no substitutions, and it all arrived bang on time. The delivery chap even checked the box of eggs to make sure none were broken, and he was extremely polite and helpful.
I fully expect there to be an odd hiccough now and again, but the whole experience for me was great. Oh, and because of the day and time slot I chose delivery cost me £1. Having set it up to use for just a few weeks due to circumstances, I'm going to keep it going as I'm so pleased with it.