My biggest problem was some of the limbs tended to pop off their posts very easily, sometimes 'boing'ing out quite a ways when the springs snapped shut.  But cracks also tended to appear around ball joints, especially with the Minicons.  I assumed it was a clear-plastic thing for them.
			
			 
				 
 
		 
 
		 
 
		 
 
		 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		