I am building an extra 330 with a 100 CC engine. I have heard some horror stories about planes with engines running but transmitters not operating for various reasons, but mostly pilot error, creating a dangerous condition. I have been considering an ignition kill switch for my plane for safety reasons and need advice.
I feel like if I install a kill switch it should be of the optical coupled type and not servo operated. Is this extra expense that will never be used or do most IMAC models have these devices? I see what I think is a good switch selling for about $60.00. Am I overlooking something better at a lower price? Which switch on the transmitter is best to operate the kill switch?

123crash