They had a buy one month get two months free going on recently for subscription ($12 a
month on a per month basis, less if you go longer periods), don't know if its still going on
though. The Williams F1 costs 11.95 by itself, base subscription comes with quite a few
courses and a couple of ovals. It does not have a F1 circuit I believe, that is another 10-15
bucks per track depending on which one you go with. No free trial period though!
To give you an idea of the simulation quality here is a list of some of the adjustments....
Throttle Pedal Shaping
Engine Braking
Engine Power
Differential Preload (entry, exit, and middle adjustable independently)
Dampers on each wheel (Bump and Rebound adjustable independently)
Front and Rear Inerters
Front and Rear Heave Dampers (Rate and Perch Offset)
Brake Bias (Base, Peak, and Begin Bias Ramping adjustable independently)
Ballast
Front and Rear Anti-Roll Bars
Base Front Flap Angle
In Car Flap Angle Adjuster
Rear Wicker
Tire Pressure
Front Caster
Front and Rear Camber
Front and Rear Toe
KERS
Pit Road Speed Limiter
That is probably not a complete list either! Most of it is adjustable on the fly...
Cant speak to how accurate the performance is but IRacing is considered one of the best
in their field.
Strip
