Ever since I invested a pile in Sonos' remarkable audio system [pictured], I've been a little worried that Apple would knock it off. (So has Sonos, I would suspect.)
The iPod Hi-Fi doesn't do that. Instead of knocking off Sonos, Apple knocked off Logitech, JBL, Bose, Cambridge Soundworks, Altec-Lansing, Logic3, and other supportive pioneers in Apple's iPod third party space (who have never gotten the respect they deserve.) Fortunately for those guys, Apple came in at a price point 2x or higher than most of them.
Essentially, the iPod Hi-Fi is a portable Bose Wave Radio without the radio. Without the iPod too. You have to supply that.