Hey all,
What seems to have been missed in the reviews of this unit is the versatility it lends to the car. I have had mine in my R32 GTR for about a year, and couldnt imagine being without it. I am going for the q-car look, and it fits neatly over the digital clock under the passenger side of the steering column. Doesnt get in the way of fast pedal usage, easy to reach to change for corners.
I use my car as a daily driver and as a track car. The driveline is standard, no upgraded diffs. Still has the HICAS bar in the rear.
The beauty of the unit is if you have a wet day, just crank up the front drive and you have a car with full time 4wd that keeps perfect cornering angle in the slippery stuff. The atessa unit does most of the tricky calculations and the 4wd controller tweaks it to the drivers needs. In the wet on Qld raceway it was miles faster through the corners, and you've got to love 4 wheel drift. Similarly in the dry its easy to set it up to make the most of all the traction available, and it significantly improved my lap times.
Similarly as a daily driver it creates predictability and pace over the standard car. I agree with the other posters that the GTR should have been equipped with it as standard.
The reason I chose this unit over some of the cheaper ones is that it has a dynamic relationship with the atessa unit, rather than just overriding it. The price difference is negligible compared with the advantage of a unit that can turn the car into whatever drivetrain setup you want.
If you have a GTR, then you have to have one of these. The old technology of atessa mark 1 can be instantly converted to something far superior to most of the modern dynamic 4wd drive.