Oh Yeah! I've raced the hpi rs4 in modified class for three weeks.
on a medium size carpet track. I swithced to the m18. The car handles way better, it's more consistant and easy to hook up. It's alot faster in the infield and exiting corners. It feels like a 1/10 touring car.
I love it. Even with that plastic chassis its the real deal.
I think it can compete moteks, ratzas, and penquin RS4 chassis.
I plan on proving it in a couple of weeks.