I would have one on any quad I ever had. When we were kids I saw a friend of mines quad go right through a barbed wire fence.. If he would of had a Killswitch it would of saved his dad a couple hundred dollars. New Plastic. I have a ProDesign on my 400ex Have not needed it yet but I am sure it will come in handy one day. Its easy to install. on the 400ex. If you look at the ProDesign website I think they have a right up with a few pics of how to install it. My Advice is GET ONE!