2
i used Netflix for about a year and enjoyed the service. The only complaint I had is that the children's movies were often unplayable which was frustrating. I remember it took three tries (and over 2 weeks) to get a playable version of one movie for my kids, and after that we just rented kids movies from the local video store.
With all the downloads you can get in addition to the physical copies it's definitely something I'd do again if I were getting rid of cable. One of my close friends is doing that now and really enjoys it.