I hadnt realised iRacing had improved this much. Last time i saw it, it wasnt that much better than rFactor and Race 07, and thats why i never went the iRacing route, i didnt want to keep paying for a game to play it. A one of purchase, back then anyway, was a much better way for me to get my sims! When the car came down to the first chicane i was stunned at how lifelike it was compared to how it used to look. Im impressed!
Simbin's GTL version seems to be pretty accurate- but much bumpier than the iRacing one judging by the video. Have they re-surfaced the track? It seems strangely smooth for a laser scanned track.