I bought a low kms '98 R33 (33,000km) from them and have been very happy with the car. State roads inspection was very thorough, said the k's were genuine and I could tell from looking at the car that it was immaculate. Had some cosmetic repair and a couple of panels resprayed but you'd never know from looking at the car except at the rear numberplate you can see they didn't blend it in as well (but I only noticed after the inspection).
Unfortunately I've had some minor rust bubbling under the paint on the rear wheel arch where it was resprayed, but that only came up more than a year after ownership. But besides that the car has been faultless, and the bubbling issue isn't important enough for me to fix at the moment. I am being pretty anal about all of the above, really. No car's going to be perfect.
Would not hesitate buying another car from them, I've loved it since the day I drove it out of the yard.