We are using the Ground EFX MC1 Cyclone. We are hitting a the local playgrounds at the parks. They use mulch so there is no real digging to be done. He (5yo) likes to swing it for a little bit and then it gets too heavy.... Then he hits the playground. He knows the sound of a solid hit and comes running over. So far we have cleaned up a lot of scrap metal from the mulch, found a Hasbro NFL coin, a costume jewelry earring, a Barrett with a bear on it, a silver Mother Teresa pendant and about $4.00 in change. Tonight he asked me when we are going out again... I get some exercise and he gets to burn off energy. The wife comes out sometimes too.... We are all having lots of fun....