The big foot is great for to cover a lot of ground and it will pick up a lot of shallow targets maybe 3inches maybe a bit more. I use it to help tell me what is in the ground good targets and if I find a large field that has some good targets I recover all I can and then hit it with the hot shot now there is a coil boy it is great for a large coil and goes very deep.
I use a little discrim as I can a little less then the nail setting and I find a lot of good targets like gold that way. In sand boxes and wood chips do the same thing the Xl is so sensative to thin small targets like bobby pins, papper clips and then the gold thin rings and so much more. If I could have 2 coils it would be the hot shot and there smallest coil I have about five coils for the Xl