It was great being included in the late development testing, and even then, the level of detail was astonishing. As one of the closest local tracks to where I live, hopping in that first time was magical. I've walked/ran many steps taking pictures of cars going around the track but never had the opportunity to drive a lap or two myself or even experience a lap as a passenger.
That said, great care was taken to ensure the details were correct, especially the kerbs consisting of multiple textures (ribbed vs shark tooth, etc). All the drivers I know that race there had praised this attention to detail!
The new update brings more pitstops for even greater track/day possibilities!