I have had a Delta 4000 for years now and got to a point that I needed something with a bit more discridmination, as I know I was missing a lot of the good things. I will note that the Delta 4000 is great at locating trash that looked like treasure before it was exposed. Then, a miricle happened and I acquired a White's TreasurePro that after watching a few videos, to get an idea of what I was in for, I decided to try my own very small front yard lawn, that the Delta 4000 said was clean. I found a 1920 penny and a 1996 dime with no trouble at all, and they were near the surface among nails and such probably from when the shingle siding was installed and later removed for aluminum siding on the house. The driveway, whch is paved, shows all sorts of coins that are under the asphalt. I am trying to devise a narrow bladed tool to cut through the asphalt to retrieve what awaits me, but this will have to wait for a hot summer afternoon, and afterwards, reinserting the plug with some repair material to hold it in place. With this new machine, I may have to change my name from TrashFinder to something else!