I use a Lesche digging tool; it looks kinda like a survival knife. It has serrated edge good for cutting turf & roots, point that pierces turf well, and heavy weight metal that won't bend. A lot of people think it looks too much like a knife, but I don't go waving it around like Rambo. It's one heavy duty unit, goes for about $39 new, but will last a lifetime. Those "coin poppers" make me nervous, I'd hate to wedge a nice gold ring out of the ground with it and have it end up bent or ruined. I like to cut a flap, dig the dirt, get the find, replace the dirt, stomp on the flap of turf ... and begone. Just my 2 cents.