Very rare USB interface which supports DSD input altough that the DSD signal must be converted into PCM unless the Reclocker can not function. I have already got a MC-3+ without USB. I guess both product are great and indentical in most part except USB I/O section after compared. Actually, the reclocker operation and the word clock generator inside make the sound more musical, densive but not quite dynamic. However, it gains more than it losts. Actually, when I synchronize it by an external master clocks, e.g. I have Mutec iclock and Grimm CC1, it performs great. In conclusion, a good tool at a good price.