I haven't tried it myself but I did try the 1st shift demo and that was awful due to input lag, I read that it was reduced in shift 2 but still there and from what I've read it still persists in this.
For me the best physics and graphics mean little if there is input lag, I just can't stand it.
On another not ISI have released there 1st Official trailer of rFactor 2.
http://www.virtualr.net/