Well turns out I had no idea what I was thinking. Once I was in the seat, I was totally blown away. It uses precise measurements directly from manufacturers when it can get them, and when it can't, the folks there actually disassemble cars to do it. In short: I felt like I was driving a real car, on a real track, and these were real, serious bumps and jolts.
Everything moves the way it would if you were in a car, and you really feel like you're in the action. The give, the movement, and even the way the harness tightens as you take turns behaves differently from car to car. I tried two car simulators, and they both were very different. I crashed on purpose—because why not—and I thought I was in trouble. Would they roll me?
Whew; they didn't.