Nice work, well working physics and handling. :-)
Good realism and physics, however its rather difficult to control the vehicle without an analog controller of some sort.
Theres a feature that allows online gaming, however the connections seem to be unstable and you lose connection a lot, also the updating on the other vehicles are really bad.
I singleplayer mode the game is great, though after short time itll feel rather boring and repetitative.
BUT its free, it looks good, handles realistic, so what can you complain about? ;-)
If youre looking for a game like Gran Turismo, this isnt it at all, its a simulator where you can testdrive a BMW M3.
Conclusion is, the game is really well made and if you practice some, it will become a challenging and fun game.