Arcadey to start but I've just started mucking around with camber, toe in, ride heights, roll bars etc. The game looks lovely, the acoustics are great and the little touches like the in car dials actually showing a build up in heat after sustained racing!
I've been researching the game thoroughly today and will be bringing another 360 home tomorrow for extended testing :-D When I have my live account set up, I'll let you know.