Well
I can share now something about the C6
The beauty excels in high-resolution.
I had Weiss 202.. Compared to the modded Transporter I had for few years until now, and Weiss and Transporter were quite close. So I couldn't justify the upgrade.
But Metronome took the high-res to completely new level. Actually, through the USB interface (this is how it is connected now in my setup) 176.4 KHz & 192 KHz my records just sound fantastic - very lively, I hear many ambient sounds I could not hear well before, the instruments and texture are very real and well positioned.
It is funny.. My wife asked me today "something wrong with my ears.. I hear the instruments coming from different places.."

Yes, Metronome brings inside the music environment.
The USB interface, based on M2Tech's EVO (?) with proprietary 64-bit drivers, is fantastic, better actually than the AES/EBU.
USB shines comparing to AES/EBU, that to me sounds a bit dull
The big surprise to me was, again, the high-resolution sound, especially for these above 96 KHz - Dave Brubecks' TimeOut left me breathless - the percussion were so real, and the speed of the bass, and sense of the air, ...
Michael