I don't want to start a war, but you really should try
GTR (the final is even better than the demo). For me, it's replaced
GPL because the physics are so much better.
One big result is that the cars respond sensitively and
predictably to setup changes. By comparison GPL cars seem numb and
quirky, particularly the Lotus. For one example, I was losing the rear
end at Donington on the left handers. I softened the RR shock two
clicks in bump (both fast and slow bump and out of something like 16
total available) and solved the problem.
The other thing is this. In GPL I reached a certain
place and didn't really know how to get faster. My best laps seemed to
be a series of gambles at most corners, and a string of lucky wins.
The cars responded to unrealistically fast steering movements, and I
can see why some people go faster with a joystick.
I can clearly see where I need to improve in GTR to
progress. My "new PB" laps are usually at the end of a string of
decreasing lap times. The PBs often look a bit slow compared to other
laps, and I can clearly see where I could be faster. Jerk the wheel in
GTR, and you'll lose either the front or the back. A joystick would be
ludicrous.
Bottom line is that my rush now comes from GTR. I've
tried going back to GPL and get no rush, just frustration at the quirky
behavior.
If you just like the GPL cars, or race online, that's a
different matter.