"New and improved"4.0 starson
Pros: New 5.1 software greatly improves stability and performance. I haven't had any problems since I've gotten 5.1. Free 3rd party software is great. You can save shows on your computer and burn them to DVD!
Cons: Some people have had very bad problems with versions before 5.1 No High Def TV (but no one has that reliably yet)