I (finally) recieved my c3 4gb yesterday together with the digizoid zo2! In contrast to all of you I bought my c3 from Merock2010 as paypal would not pay bigbargainonline directly from my bank but only with a creditcard, for some peculiar reason nobody knows. It came in the standard box with a chinese manual and a cleaning cloth, nothing else. On ebay the c3 from Merock2010 shows a different, in my opinion better looking, backplate, I in fact recieved it with the usual backplate, sadly. Though I couldn't mourn too long about it as it is only a cosmetic aspect which cannot be seen when I attach the digizoid to the back. In the little time I had I still managed to put some music on it, as it didn't come with the usual standard music files.
I gave my new device a good listen at work yesterdag and in the train and bus to and from school today. I noticed an immediate improvement in terms of music quality, but that was of course expected considering I had been using my HTC wildfire s smartphone before.. After a while I was completely stunned with the brilliancy of the music, this is by far the best sounding device I have ever heard, especially when playing flac. It is even better than my asus laptop (though I have not yet tested my laptop with the digizoid, that will probably make a difference too).
Unfortunately there are a few things I miss. For the c3, like many others said, I would have liked hard volume buttons and perhaps a hard lock button (instead of the slide movement over the touchscreen, which doesn't always work flawless for me). Also you can't search for songs! You have to scroll to all the music to find a song. Of course I knew this all before I bought it so I shouldn't complain about it. For the ZO2 the only thing little con is that it feels fragile, I don't know if this is the case though, because it still works after a day! Also i will probably break the interconnect within a week or so, because it is a thin cable and I seem to be doomed to break thin cables.
I am not at all an expert in terms of hi-fi music, I can barely be called a novice, but I can say for everyone who is doubting to get one, that I am completely blown away by the performance of this combo and I don't regret a single penny spend on it. At this very moment I am filling the 32gb card that came in just a bit ago with more music! :D
Setup I used: Colorfly c3; digizoid ZO2; V-moda V80.