3 months with f75 SE. Today was out for a little hunt decided to test it in the volley ball court. Ran in every mode after putting a dime 9" in the sand. Ran each mode 15 disc and 80 sen kept moving it up. Ground balanced every time first auto GB then manual up it 3 auto was 79 up it to 82. What really got me was all mod's picked it up but not a strong signal high tone choppy vdi jumpy. Then i put it in the PF mode solid hit dead on vdi stayed their, like the dime was laying on top of the sand. Getting to learn this machine takes a little time learn something every time i take it out. I have had the Gold bug Pro-MXT-Minelab Safari. This is the best one yet just takes time to learn once you have look out.