I have been swinging the 350 for 3 months and I have found almost 700 coins along with 4 silver and an 1887 V nickel. I decided to do a test garden tonight because I was concerned about depth since everything I dig seems to be 4 inches or less. I had a dime and quarter at 8 inches and a dime at 6 inches. I never got a signal that I would even consider digging, maybe on beep every 5 passes, but mostly nothing. Not real happy about that . I had fresh batteries and the sensitivity all the way up. I would like some input from some other 350 users.