How is this any different than the Netflix free trial? NetFlix
All I see different is that you can only have two DVDs at a time with Wal-Mart's free trial and with Netflix you get three. Wal-Mart's price is about a buck cheaper per month but the site is weaker than NetFlix (although that might be because I'm used to the NetFlix site and like their recommendation system).
I would suggest using the Netflix system over Wal-Mart's even at the lower price point.