I recently bought a used F19 and have used it for about 20 hours. I hunt for coins and jewelery, but occasionally find buttons, rivets, and other assorted brass items. The most impressive trait of this detector when you get the coil over a coin is how the numbers lock with little or no jumping. I have found several coins in the eight inch deep range and I have found the numbers will read slightly higher than a coin of the same denomination that is shallower. For instance, a five inch deep copper penny will read 82-83, but add the same coin three inches deeper and the number will be 88-89. Coins seldom jump more than one or two numbers and most of the time they don't vary at all. For the bad. Small foil will show coin like numbers and faint sounds. I was getting fooled a lot before I started trusting the F19. When I got used to what a coin looked like with the tight numbers, I found the foil would jump four or five numbers. It was hard to pass these signals by, but the trait that made foil identifiable, was a bigger number spread than a coin. I quickly found out that deeper nickels would also lock on tightly with their numbers. I am digging many nickels 6 to 8 inches deep with numbers almost always 56 to 58. If the number is higher than 58, not a nickel. Amazing when you stop digging the 58-59 numbers, you stop digging junk. Today, I got two targets within two inches of each other. One read 57 and the other was 80. Nice tight audio when I slowed the coil sweep down on both. I isolated the 80 number and dug a silver war nickel. Two inches from the wall of the first plug I got the 57 number and came up with a no date Buffalo. Both were 8 inches deep. I am still getting use to the two tone audio, but I am finding that coins are softer and quicker zips. Today I dug a small(about 1/2 the size of a dime) brass number tag that was almost touching a rusty nail and it was 6 inches deep. I have also dug several jeans rivets at like depths with crystal clear audio. The F19 is not a perfect coin detector, but when you take into account how good it is at relics, it makes for a well rounded detector. I set the disc at 38, V break at 54, volume 13, no notch, sens at max. I am running the stock 5x10 coil. My ground is in the high 80,s. It runs extremely quiet at max sensitivity. I got 17 hours on the first battery which is better than I expected. Pretty neat detector.