As an rFactor sort of old timer, I began with rFactor in 2007, bought the Lifetime rF2 from ISI, than put rF down for about 6 years and came back about a year ago. S397 seemed to have struggled with getting the tire physics right. I suspect in a large part that came down to understanding a few of the real life characteristics, thermodynamics being one of them. They've come pretty close in the last release of RF2. Way better than any other race sim. But the real thanks is in the string of cars they've recently released. In a word fidelity comes to mind. The Brabham BT44, March, McLaren Series, wow, simply incredible work! Thanks! The quality of these mods is fantastic. They behave so close to what an old former road racer with 30+ years of real tracktime would expect its nothing less than delight. One more time, thank you very much guys!