All I use any more is the Smart-Fly Kill Switch. Used to use the choke servo method and also the throttle trim. I still can kill my motor with the throttle trim - AS A BACK UP to the Kill switch.

I have ran only DA-50's and when I would use the choke servo to kill the motor - it would require quite a few attempts to start the motor before it would start.

With the throttle trim - and after I used it to kill the motor - it would be kind of a pain to get the trim back to the original location - resulting in your idel RPM being off - which can be unsafe, especilly if it is high.

Now with the Kill Switch - land - kill the motor at idle - refuel - flip - flip and off you go.