the feed back from my friends that are already on the RS3's is that they were no where near as good as the star specs in the wet. the sidewall is super flexible on the RS3's but they grip level is incredible. we took a video for our suspension sponsor a few events ago and the most impressive thing we saw was tire deflection.
https://www.youtube.com/user/shenani.../1/wfS1UltZsTw
if you aren't going to be autoXing starspecs would probably be a better option. i will let you know how i like the RS3's next week. i am going to DD on them for a week and then take them to their first autoX on the 17th.