I have a C90 in a closed back frontloaded 1x12
it's too bassy for my modded '73 JMP (well, the v30 is too nasal for my JMP, anyway), but tone is great
maybe the excessive bass is cab construction's fault
the black shadow is very growly and open, with some nice top end edge
it's like a hugely improved G12T75 with a lot more mids, bit more low end punch and smoother top
thing is that the V30 always wins for overdriven/distorted miking