Just played the first cup on Subsonic.
Verdict: very good.
I'm still acclimatizing to the handling, but the difficulty level is fine. It's challenging, (I expected that) but it feels more fair than the first FAST Racing on Wii. I was able to place 2nd on every track on my first try, and 1st overall since my opponents didn't consistently place 1st. (I dislike in racing games when your opponents place in the same order with clockwork regularity, making any loss more damaging)
And good grief, they weren't idly boasting about their graphics. This thing is all kinds of gorgeous, with awesome lighting and a silky 60fps.