I looked into it couple of months ago and I was fairly disappointed.
Don't get me wrong though, I like the idea of having a digital receiver and good USB audio from my computer, and it looks cool.
But here is what I don't like. They seem to use the USB for audio and controlling the receiver (setting up the suround environment etc). I would have bought it on the spot if it was the other way around, if it would have controlled my computer.
Start/Stop songs, skip to next, act as remote control (now my only option is to pay $50 for Keyspan remote). One can continue imagine the possibilities, I select Internet radio stations and it will wake up my computer, start Quicktime and connect, display iTunes songs etc. But something simple would do in the beginning. Since most of the work would be on the computer they could provide some simple interface so people could add to it. After all it is just sending control information to the computer, which then does all the work.
Everything I'm talking about is easy to do/add and the hardware would have stayed pretty much the same (except the remote). Instead they made this into a lame receiver. If you get the version with radio, tha Cavit doesn't even remember your preset stations but has the computer do that. What is that all about.
My theory is that the Engineers designing these things still haven't got the idea behind the digital appliance revolution. They probably still think that their CD players are cool.
Since there is nothing special/cool about the Cavit (except maybe the look) and you want a digital receivers there are a lot of those available. Many of the new ones have USB audio sound input (act as USB audio device to your computer - no special drivers needed). I got the StereoLink USB audio converter and use my old stereo. It is cheaper. Roland has one more popular.