I am new to the sim (as of December).. and I will add myself to the MacbookPro small list of users. :thumbup:
I bought my MBP in early 2012, so it's fairly new and handles everything gaming-wise with ease. I run Bootcamp with Win7 x64. I have not overclocked anything, nor upgraded any hardware, and the sim works great for me so far.
I am also a HUGE sim-racer (as that is my first passion) and primarily use it for that. No issues there either. I've built my own sim-cockpit... now I need to modify it with joystick and throttle mounts. :music_whistling: