Judging by the time the physics have been in development they better be than real life.
I'm pretty sure Scawen is trying to do the best physics of all time and I'm pretty sure they are already better than EVERY other game out there and the road to perfection, as ShannonN said, is infinite.
I had to spend the 14€ I had reserved for S3 since it was announced on C.A.R.S. because I got tired of waiting and because I like their "open" model of development.