I`d been playing LFS and GTR2 for a couple of years (never used my GTL disc apart from P&G installs due to starforce, until recently). For some reason, I`d never bothered with rFactor, probably due to trying the demo a while back and finding it absolutely horrible.
However, I did decide one night a few months ago just to go ahead and buy it anyway, since I`m always modding games anyway, and figured it was worth a proper look.
I`ve definitely not regretted it. In fact I`ve had more fun racing with rFactor so far than any of the other sims combined.
Go get it