I've read else where that if the 4in1 gets too hot, it will cause handling issues. I cut out the entire smoked canopy, cut open a hole under the 4in1, and drilled holes in the 4in1 case. Also, poeple have had issues with the 4in1 failing due to crashes. It seems that if you hit something with a rotor blade under power, it will blow the esc. When I think I'm going to hit something, I cut the power completly. The CX will drop like a rock. But it's better to replace skids than a 4in1.