I have a Maxx and Savage and have broken about three or four arms on the Maxx. Since the Maxx is basically my second vehicle, I opted for the RPM plastic replacement arms..much beafier than stock. Since adding these, I have not broken any. If my Savage ever decides to break an arm, hasnt in 4 months of bashing, I will replace with aluminum. So if the Maxx is your main ride and you value beauty as well as performance, go with aluminum. However, like I said the plastic rpm's have held up terriffic.