Sony Bravia Tv Internet Link Bolt On- Is It Any Good?

I saw that my Sony Bravia flat screen TV sells and add on internet link that is supposed to allow you to browse the web from your TV. It sells I think for $250 or something– seems like a lot. Is it worth it? I also have a playstation and a Wii attached. Does it give me any additional benefit or since I have these gaming stations attached is it repetitive? What exactly does the internet link bolt on allow? My thanks.