I got a Compadre 8 inch coil machine thanks to super fast service from Kellyco the day before Christmas Eve. It's only been used in my yard and one next door but with excellent results. I'm learning the noises it makes and what constitutes a decent target. I do get fooled by a number of very old deep pipes we have that wander around the lots in the oddest places. However over time the crisp clear sounds are more than likely coin shaped objects. The unit is run just above pull tab right now. Otherwise I don't get a foot at a time without a hit. I've noticed that small old copper rivets product the same sound. At times I find nothing right away but the Compadre insists there is something in that pile of lose soil on my digging sheet. Even with the Garrett Pin Pointer I have to run it thought the pile a few times even hand holding small amounts of sandy soil to find the target, sometimes BB small. The Compadre is proving to be very simple to use, light in the hand even using it from the pole up close, and reliable. The only problem I've encountered is that is will not work properly at all if the Garrett Pin Pointer is on. A very minor issue I just have to remember to shut off the pin pointer if I set it down switching between the two while checking a section of soil. For the price I paid the unit represents an excellent value. It's been a lot of fun and I'm very pleased with the purchase.