What struck me was how innovative and interesting the UI is. I’m a long time MythTV user, and while I find some of the ideas a bit gimmicky, some make a lot of sense. I’ve got one of those “invasive” full screen UIs on my box. I actually like the Myth UI but seeing a different “take” on design is always interesting.
Perhaps the Zonbu could crib a few ideas from the media center interface, to make interactive with it even easier.