I just upgraded from the original Roku to the Roku 3.
Pros - 1. I like the fact you can search for a show and it will tell you what channel it's on vs having to change to each channel the search for a show. 2.) Wi-fi connection is faster.
Cons - Last Sunday, after 3 weeks of using the box, I got audio but no visual. I did get an error message "hdcp unauthorized content disabled" indicating that the HDMI "handshake" between Roku and my LG TV was fubar. I had to disconnect the HDMI cable and power down the TV and the Roku then connected the HDMI cable and turned on the power and its been working fine.
Meh - It shows a wi-fi connection but you can't stream movies from an external source through the connection unless you install the Roku app on your Droid after which you can stream movies, pictures or music that are stored on your phone.