The downloadable version doesn't use SF.

But regarding the game: it's amazing. I bought one of the last compiles (Trackmania United) for 15 bucks here in Brazil. Worth every penny. There are many different classes of cars and track styles (from 400Km/h sports cars on a highway to 4x4s on a frozen lake), it's incredible fun and it looks great if you jack all the gfx up.

It's damn well worth playing. I used to play it on a Athlon 2800 and a 6800GT and it handled well enough. Now with an E4400 and a 9600GT it runs maxed out at well over 80fps. Try it out if you can.

All work and no play makes me..., well, you know the rest.