We have Netflix at the 3 at a time price. As soon as they receive one back, they will automatically send the next one on your list. We like to try to send one back every 3 or 4 days so that we keep getting new movies every few days. On the two occasions that we got movies that we could not play for whatever reason they were very nice about it and were prompt at sending us another copy (free of charge, of course).

My only minor complaint is that it takes a few days longer than they advertise to get your movies, but if you get a good rhythm going with turning them in seperately you should always have a movie or two to watch.