I am using C10.
C10 and C10 II just better PCB and better resistors.
Anyway good product.
But I do not have chance to compare between C10 and Accuphase say 290V, 2800 or 3800.
C10 is full balance with resistor-array volume.
Accuphase also full balance with AAVA.
May be they are similar grade but C10 was 20 years ago product.....