Today was my first time out with the FX-1 on my F-75. I was underwhelmed until I started using the pinpoint trigger while probing the hole. I've got the system down to pinpoint with the main coil, flip out a flap plug, use the FX-1 to see if it's in the plug or still in the hole. If still in the hole reach over and pull the pinpoint trigger. Works great when used that way.