After 2½ years of Netflix (since April 2004), I've apparently rented or watched anything I wanted to see, more or less. Also, I don't have the money for it right now, I may be moving someday soon, and I just don't really have time for renting these days.
But for 2½ years, I could not have asked for a better rental service. I tallied up everything I had ever rented, and what I had ever paid, and it came down to $1.83 per DVD. Not too shabby at all.
If you've been considering an online rental service, and were thinking of doing Netflix, go for it. In maybe 6-8 months, I'll probably get myself an account again, to watch anything that will likely hit DVD in that timeframe.
Just a really nice overall experience.