It's top heavy and the Magnus component may be prone to sliding off and possibly rubbing up/scratching the chrome on Fire Convoy/Optimus Prime's chest. I found that the chrome on Optimus Prime's chest to be more durable than on Fire Convoy (the only part of that toy which is better made than the Takara version; the rest of it's inferior, especially the poor quality rubber on the tyres). Take it easy and be sure that the tabs are connected in properly. It's pretty much the same flaw that Super Fire Convoy has anyway. Still... this was one damn cool toy at the time.