I'm running 225/40/18 Hankook RS2's, but unlike wagonbacker I love mine. I think this is mostly due to the size he is running, as the lower profile tires have a more rigid sidewall. I autocross at every local event (2nd place in STM for the season), and they have done great there. A little faster than my previous tires which were 215/40/18 Nitto Neo Gens. I actually really liked the Neo Gens as well, they performed really good at autocross once they were bald (if you don't mind sliding into corners and getting the back out, lol). They were really suprising. I ran a size with a stiffer sidewall so YRMV. Also have ran Toyo Proxes 4 in 215/40/18 and they were alright, a little worse than the Neo Gens.
Of note, I will be running 225/45/15 Hankook Ventus Z214 C71 for next season. Will report back after the first event.
edit: All these tires and I've only had the car for 23k miles (at 57k now), I also ran a set of stock size tires before the switch to the Toyos, lol.