I've got one, thanks to the boys at Autoworx in Perth.
R34 GTT manual sedan... Happy as a pig in sh*t myself.. They are awesome, as macsta said, they are a great alternative to an SV6 or an XR6 (T/nonT) and as we know, teh NISSAN is much HOTTER! Mine is a conversion and as has been said, if done properly, it isn't a problem at all, fun to drive, nippy and just a real pleasure to be in really... However, I'm getting about 400km/tank to about 440km/tank, the fuel efficiency isn't as good as the Aussie cars, but a few mods (chip/ecu, 3"exhaust, AFM, 02 sensor, intercooler, EBC and a decent tune) will find you clock some decent miles per tank even whilst having plenty of fun under the bonnet.