+1, driven a 32 GTR with one of these Jim Berry 'full monty' I'd say it's vaguest clutch I've tried.
Out of these two clutches, go for Nismo Coppermix twin, these Nismo can cop proper punishment as Paul have taken me few high RPM launch, so did other chaps with these Coppermixs. Can't say about NPC as I've yet to sample one.
If you're wanting to be a man, I'd recommend OS Giken Triple had one in my previous GTR, surprisingly easy to use in traffic as they're not that bad people make them to be (I daily drive my previous cars and I plan to daily my next car).
Ring NPC and ask?