I own a Minelab GP3500 and usually run DD coils. One day, when at a Minelab dealers shop in Ballarat, I was given the opportunity of taking the 11in Coiltek Elite for a test run. Another prospector was standing beside me and said “mate, those coils are too sensitive for your old GP3500, you will get nothing but ground noise” I was undeterred, I had heard how good these coils were, and Coiltek would not say they would suit a GP model just to get sales, so I was in I headed off to a patch that I had got some nuggets from and thought I had cleaned out.