Vark does good work, but their bench time is extremely expensive. Nearly $100/hour.
If you like the Nbox over CMC setups, the only scientific reason I can think of would be the 20-25hz roll-off which clears up some of the sub-sonic gunk. I am not so sure I would say it's better than CMC6s, but its certainly a very high quality replacement for bodies.
This should be pretty easy to comp as mono channels. When me and Acidjack can find a good opportunity, I've been thinking of the comping the following setups, with possibly a few others I can't disclose just yet:
MK > CMC6
MK > KC5 > CMC6
MK > KC5 > PFA
MK > KCY > Littlebox v2
MK > KCY > Tinybox v2
MK > KCY > PFA
MK > Nbox cables > Nbox+
MK > Nbox cables > Tinybox v2
MK > Nbox cables > PFA
Wish I still owned the CMR's, however they'd be pretty easy to reacquire for a comp.