I have been using Ocado almost since it first started operating. There is always good availability for delivery slots, deliveries are very reliable and they are good at keeping you informed if, on rare, occasions things go wrong. The website is easy to use and it is easy to search for bargains (half-price offers, BOGOF offers etc). The only reason that I have not given 5 stars is that from time to time packing can be rather haphazard with items getting squashed or damaged. That said, I have never had a problem getting refund when this has happened (although, of course, sometime you really don't want a refund you just want the item to arrive as it would if you had packed it yourself!)