I've listened to my C200 now some hours and I can say, I think it's perfect upgrade for C3. Sound signature is quite similiar, but C200 sounds somehow fuller. I don't know if I'd call it warmer, but it's just somehow a bit more organic, making C3 sometimes to sound very slightly thin in comparison. Not huge difference though. When it comes to soundstage, that's where great improvements are imo. I think soundstage wideness is pretty much the same, C3 has great soundstage, but imaging goes to C200. It's just more precise, more air between instruments and overall cleaner presentation. TRANSPARENCY! I also hear C200 brings soundstage a bit forward on middle, making vocalist to stand out nicely from music. I definitely don't regret purchasing C200, altough there's one really annoying bug right now, which I hope will be fixed on next FW version. But sound is so good that that drawback can be overlooked. Also really great thing is that C200 obiviously has more output power, and no more need to use external headphone amp.