This one stands out for me from the other (and equally epic!) SimBin series in that there is some great mods out for it. So if you get bored with the oodles of tracks and cars (with the various offical add-ons) you can always load up the Corvete Meeting Mod in GTR 2 and drive your old school C4 Vette around!
Also, this title works with everythng! TrackIR? No problem! Eyefinity? Easy! Steering wheels and HOTAS? Absolutely! Stereo3d (S3D) with IZ3d, Tridef and AMD3D? All verified and awesome!
How about Simcraft professional racing Sims? Yes, motion and VR/HMD headtracking support? All baked in.
I've played this using all the tech stated and I can tell you that despite the latest eye-candy rich sims out there, I keep coming back to this one. The hardware requirements are very low by todays standards and will run on almost anything. It is nice though to crank everything on MAX with a decent modern GPU. High fraps and it still looks very good IMHO.