My first Tesoro was the Vaquero. Is very deep but no tones, sold it after three years. My Golden isn't quite as deep, gets a dime in air tests at 9" max. I'm keeping it in case I start searching for gold jewelry again. It has fixed ground balance but in my mild soil it works fine. The Goldens best feature is the 4 tones and the 2 Notches. Notches can be made a little narrower or wider when needed. The regular disc knob and the notches can both be used at the same time. Only ladies gold rings will be accepted while in notch mode, class gold rings and mens gold rings will be rejected along with the pulltabs and screwcaps. While in notch mode the Threshold can be turned down for even better rejection of the deeper tabs, strange but the deeper tabs are harder to reject than the shallower ones, the Threshold helps there. I like the Golden, great tones and goes plenty deep. Its my gold machine but I tried it in a field one time looking for old coins and it surprised me at the depth it was finding tiny brass rivets. It isn't my main old coin detector but its a keeper.