The one main issue with LFS right now is the number of people online. Generally speaking, on week nights there is only 1 decently populated S2 server (which is multi class racing, so even if 25 people are on, you might only be racing 5 of them) and a dozen populated demo servers that you are already familiar with.
On Saturdays, the main S2 server switches over to XRG/XFG only on a variety of tracks. You may be bored of these cars from the demo, but with the constant track rotation and 30+ drivers on the grid, Saturdays are a blast. People drive respectfully and, with that many drivers, you always have 2-3 people at your pace who you can run bumper to bumper with.
Sundays, the main S2 server either runs FBM (so another demo car) or GTR. Either way, the racing is still exciting. Not as close as the bumping and rubbing you can do on Saturdays, but there are still big grids and a variety of tracks.
So, I guess it really depends on what you want. If you're only prepared to commit to weekends, then I reckon you can still easily get your money's worth. If you want racing every night, you might want to look elsewhere.
Off Topic: Why the heck does Cargame.NL run the FBM and not the FOX? I can run the FBM all week on demo servers, so why not let me run the FOX once and a while?