I have a 853 with the transport gear. Accidentally put it in transport and that kill switch did save my bacon. I have several attachments, one being the rotary plow. While working some new land I hit some root ball from a former tree that jumped the BCS and jerked it from my hands. The kill switch gave me confidence that day that I need to keep it hooked up. Someone above said you hate it until you need it. No matter how careful you are and safety conscious you never know what lies ahead.