I bought a really nice used IDX Pro last month with the intentions of having Bill do his mods on it. When I got the detector, I did a quick test with 4 different coins laying on my lawn. I have some pretty nasty ground and I wasn't surprised to find the ID segments were off one block. I got the detector back from Bill yesterday and today I repeated the test. The threshold and ground balance mods worked like a charm and the detector balanced quickly. Every coin I checked was spot on with the meter. What was more surprising was how much distance I could get with the aircheck and still the ID remained perfect. I was able to get the sensitivity to the 4 oclock postion which is where the boost kicks in. I got a 5.3 inch coil ready to go and I suspect it is going to be a hot setup. Bill did an outstanding job and I am more than pleased. R.L. Johnson