I used to use one and did great with it. The one I had was one of the first ones before they had the auto tune on them, so we had to push that button on the handle a lot to re tune it. I still have one my late Dad had and his was one of the hip mountable ones with the auto tune on it. Being it is over 30 years old it still works, but not the best as I am sure many of the capacitor are dried up. If yours is working correctly they will not reject a pull tab if i remember right. When you turned them on you have to hold the black button on the hand grip in and adjust the tuner knob so you have a slight threshold then release the button. Now that it is tuned you would have a starting point so when you lowered the detector to the ground to the height you would detect you would push the button and released it and have the slight hum and start swinging away and not bringing the coil up or the threshold would raise too. Threshold would drift a lot so you would be always pushing the button to re tune it. When the auto ones came out it made it so much nicer as it would adjust the threshold if you raised or lowered the coil, but it was slow in doing so and we still would use the button to help it re tune faster. Back in those day these were no motion detectors, but with auto tune you had to keep the coil moving or shut off the auto tune.
My Judge 2 and my Relic Mag pro and Relic mag 7 got me a lot of nice silver.