The RC worked without any serious problems. I could not play with the new 'stable' build for more than 5 minutes without CTD. Any time I tried. I know that in theory it's the same as the RC. But it is not.
The new dust effect looks like the dust is always blown by wind. The dust disappears too quickly. And it's too white. So much better than the old one though.
The simulation was just stopped for a couple of times in every session I tried. At first I thought is was a complete freeze, and then I realized that everything else worked fine, but the car. It stopped. Marshals were talking to each other, shadows were moving, but the car just stopped for 3-4...