Only issue i have with Netflix is for a while, you get movies received and sent out quickly...and after a while, it slows down.  I was enjoying the fact I could watch a bunch on Sunday, send them out Monday, be received Tuesday and ship Tuesday....so new stuff Wednesday.  Repeat process, get roughly 6 movies a week.  Now, its only 3 a week the way the turn around is.  Complain about it, it improves for a while, then goes back to slow-mo.  
Still, a great service for getting all those TV Series DVDs.  (ST Voyager, X-Files, etc)