I have only had this for a few days, but I took it out to one of my trashy sites, first thing. I found two quarters and some dimes and pennies (all buried, so obviously not NEW targets, and in only an hour!)- that I couldn't find with the stock coil- because of all the signals under the coil! I tried it at my relics site, but still couldn't find a coin mixed in with the 'square-nail beds', YET! The TIDs are slightly different on the lower conductive numbers, but about the same on the higher ones, so do a test-garden first. I LOVE the product AND High Plains Prospectors!