We've been using if for about 6mths. Really like it, so easy and the shipment time is about 1 day either way. Much better than regular rental ( I never seemed to make it back in time). I don't subscribe to any movie channels on cable, it's much cheaper to do netflix and pick the movies I want to see rather than the few they show over & over again.
The selection is also very good, many that you might not find at a rental outlet.
The only complaint I have would be that sometimes new releases are slow to get. We've been waiting for Holes & Pirates and haven't gotten them. Other new releases I've received on the release day so it just depends on where you end up in the queue on release day it seems.