My opinion on the Niki? Since they're generally one of the more dangerous opponents, single them out and kill them FIRST whenever you see them. It's nothing personal or anything against the pilots, but there's no way in friggen hell I'm going to let one run around unopposed in a furball. They're too fast and have too hard a punch to NOT take them first.
Second of course are any A6M variants, followed by spitfires and CHogs, and certain 109 variants. Everything else gets to live until the sucker planes are dead.
As for my opinion on actually flying the Niki, it's one of the only planes in AH where I've had one of those amazing uber-multiple-kill sorties in the MA. If I recall correctly, I've had 10+ kill sorties in the CHog, Niki, and FW-190, mostly way back when I was flying more often.
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eagl <squealing Pigs> BYA
Oink Oink To War!!!