Being the only ISI car in rF2 I have driven in real life, I would say it is pretty realistic, with the one exception that I find all rF2 vehicles have, which is too little rear grip. I hope this will evaporate when the new tire contact patch comes, because it feels more like a tire/grip issue than any fundamental physics problem. These cars are extremely "tippy" and you can spin them 180 with little provocation, especially if it's damp or any slight reduction in track grip. Just like the real one, you better keep your foot on the throttle through turns unless you want to be frustrated and embarrassed. But the real one feels just a bit better planted and less twitchy when the rear wheels are being asked to dig in. Have you driven an older 911 or Beetle? They didn't call the 911 the "doctor killer" for nothing. You have to drive differently than you do with a front-engine RWD or FWD car, but once you get the hang of it, it's quite thrilling to be able to power through corners...carefully!