I'm not saying they don't work, as they are indeed better than standard R32 GTR brakes (but only marginally) - I was merely stating that in comparison to paying $700, he could save most of that and just replace the pads and rotors i.e. Ferodo pads and RDA rotors ($228 all up) and see how it goes.
I just know that for any Skyline (especially Skyline GTR's) bigger brakes are always welcomed considering their weight.
I think a good set of pads and good rotors will work fine for occasional track days.
However, when you have a 350+rwk to go with the package, I know I like the idea of having something larger than R33 Brembos to stop me, and I presume will also help cut lap times down (not that I've ever done that)
Just my two cents thats all