Benny, I've driven many GTR's, and this thing has to be the best! I can't put my finger on what it is exactly, because as you know, tarmac rules dictate that very few mods can be done. You know, no adjustable arms or bushes in the suspension etc. We had the guys from MPC go through the suspension because we felt it was far too stiff at Targa (minimal weight transfer in the wet particularly), had some new springs made (the rears were binding terribly) and it's transformed the car. It turns in like nothin else, and has a great little bit of oversteer on the corner exit if you choose to drive it that way.
The only issue, and it's a MAJOR one, is the amount of pad knock-off happening. It's really bad! So bad in fact that it actually detracts from your concentration because you need to be consciously pumping the pedal after every little corner, rather than just giving it a little tap when on the straights. Hopefully moving to a full-floating disk will cure it for Buller.
As for HICAS, as far as I know it's still there in all it's factory glory.