Rightio.
I have the first GTR version in my car at the moment (more may have been put in since). I went from a PFC to the Link G4 and the driveability difference was amazing. Now having the Blackbox in there i reckon it's that again. The snapiness and just how crisp it is is really leaps and bounds infront of the two above mentioned ECU's. I always had a few little issues starting on E85, with the blackbox it's first go every go.
I changed from the G4 simply because I ran out of input / outputs. Between the Ethanol Content sensor, Wideband, staging fuel pumps, oil pressure and fuel pressure safe guards, crank trigger, I simply had no more room.
Now, as far as I know, Yavuz is the only one that has this software (I could be wrong though), so if that's an issue for you, then this ECU may not tick all your boxes.
You're obviously in Sydney so if you're interested, by all means come round and take my car for a drive.