I did some contract work with iRacing.com. I know they have a lot more cars and tracks than when I worked with them about a year and a half ago.
It's very impressive. The driving dynamics are as close to spot on as you could be and you can truly use this simulator as a way to practice a track before you get there. They actually go out to the tracks and laser scan every millimeter of the surface so all of this translates into the simulator.
It takes a little getting used to as you are missing the "seat of the pants" feeling of speed so you dont realize you are going as fast as you are. So you are going to overshoot corners from braking way too late.
Having driven lime rock park in real life and on the simulator it is as close to perfect as could be at this point. It is really cool since you can actually use specific points of reference on the track just as you would in real life.
Basically think of this on the level of a flight simulator and not a video game. It is simulated motorsport at it's best.
Still basically bone stock 2003 SVT Focus. Energy Suspension control arm bushings, ES sway bar bushings, Moog front and rear sway bar end links, Hawk HPS Plus brake pads, Dunlop Direzza Star Spec tires (best performance addition by far!).