bought AC few days back. best sim i ever played so far and i am quite big LFS fan, playing it for 5+ years now. yet AC just smokes it, hands down
physics are great, FFB is just epic! i worried about physics before i bought it, i was afraid it will be bad, but i was wrong. they are great!
tho i have to say, its quite unforgiving. if you over do it, you're out of the track or in a wall. all cars feel different and you need to get use to the power, Lotus Type 49 is insane! can't wait till they release finished version.
from that review in ISR about physics and tire model:
Do they live up to their reputation of having the best tire model in the industry?? Yes and then some ! Very easy to get a feel for. What you would expect from Kunos based on Netkar Pro. The best tire feel around when it comes to that “rubber meets the road” feel.