I have to agree with Jammin on the losi arms. I have never seen one break. We have a couple of guys at our track that I think should be part of the stress test department at losi and even they have never broken any arms. I have been running the losi for two years now and I am considering a move over to mugen. The two positives that are pulling me to a mugen are the steering and the droop through rough sections. The suspension just seems to handle the rough stuff and keep the rear end tamed better from what I can see on the mugen. Although the mugen arms may be prone to some breakage, I am willing to bet 9 out 10 times it was more the guy behind the triggers fault than the product. Clean and smart driving keeps the parts intact. These are race vehicles and made light for performance reasons. Alot of guys had similar problems with the short course trucks made by HPI with the ese blitz edition. You have to comprimise strength for weight in some instances.