Actually after playing it now for a fair few hours I take back all my previous criticism
The only thing that lets down the close racing experience for me is the collision engine.
Its a bit abrupt, a little nudge makes cars bounce off wildly.
It would be nice if there was an adjuster to change the collision effect from over realistic to arcade.
I fancy building a track, which seems quite doable. The least I can do for getting to enjoy such a wicked game for free is to give something back into the pot.