II suppose it depends on what you want. I have the package that allows 2 dvds at a time, and they get replaced with new films within a day and first class post. You have to have a list of ten or so films/games/tv programmes, that you prioritise. So you never know for sure what from your list, is going to turn up. The streaming is pretty good too, there is plenty to watch. More on the full website than on the ps3 front end.
For me, there was not enough on netflix to warrant the, albeit small, cost. It did not seem to change throughout my trial either.