Interesting article about a very well known (and fast) simracer testing a Formula one team simulator
http://www.virtualr.net/dom-duhan-on-driving-in-a-formula-one-simulator/
After only 24 laps he was only 1 second slower than real F1 drivers on this simulator !
I still remember the F1 1979 FLOG series where I qualified in front of him at Monaco
(well ok I was driving a Tyrrell and he was driving an Ensign but who cares ?
)