So I tried the PS3 demo after the PC demo (same content) and I can't believe how much different it feels using the Driving Force GT... I had to calibrate the wheel settings extensively to get it to feel somewhat right on the PC, but I didn't have to change much at all in the PS3 demo. Also, I dunno if you need drivers for the PC, but there was no force feedback, just a slight resistance on the PC whereas it was in full effect on PS3.
I must say, the driving physics feel a lot better than they did on the PC, but that's probably due to the fact that the wheel was already calibrated right, and there was actually FF; but it still feels slightly off and slightly arcadey. The gas and brake are A LOT more sensitive than they are in GT... driving a RWD car, even if you have the pedal not even 1/4 down coming out of a turn, your tail kicks out a lot. If you turn down the acceleration sensitivity then your speed drastically reduces, so you really have to feather the gas (especially with the Zonda).
What bothered me was, once again, the collision physics and the AI seems to always try to spin you out by nudging your tail. At the start of a race at turn 1, I'm always lucky to get by cleanly without a big chaotic bumper cars match in which I dunno what the hell is going on because of the blurring. The cars seem to be too light. But once I get past everyone though, I can race my race.
Still on the fence but leaning towards a bargain bin buy.
edit: used Pro settings btw.