Part support for GS in my area is not easy. I haven't driven the Caster or even seen one in person, I can only go by whay I have seen on the boards here and the price. I have the Hyper ST Pro and it is built like a tank. I have one race year on it and the only thing I have flat out broke was one of the rear hub carriers landing over a massive jump. Over here on the east coast it mostly a Kyosho ST-RR's and Losi 8ight-T's and I fair very well against them at the track.