I have only broken 1 arm to date. It's the kit supplied arm, 75%carbon content. I have crashed numerous times, and sometimes kinda hard but so far i've been lucky. The best way to keep them arms breaking is by not crashing
The RDX is a very good car and the arms issue aint a big thing in my opinion. Just my .02
Btw, what does raisng the rear roll center do to the car's handling? Does it give it more grip entering a corner? Thanks.