Annoyance. Not sure if it is a good thing still. I think the name BBC fits into the Ebony tag quite well.
Why AC/10 and not UAC/10? Is this a case of "I had it in my garage and so used it"? I might be mistaken, but from what I understand, the Clan ACs are effectively the same thing as the UAC without the double tap and taking up one extra critical slot.
For cAC10 and cUAC10, there is a difference in heat. UAC is hotter, but you can double tap if needed. Same goes for cUAC20 actually.