It would be very interesting to see how the F75 compares to an MXT and XTerra 70, both with the elliptical 10" DD coils. I'm thinking about picking up a detector for prospecting and all-round use (but a lot of prospecting) and, so far, it seems to be these 3 detectors that are in the running. I'm not so interested in the big stuff ( when the Pulse Devil finally is released it will leave all 3 in the dust) just the tiny stuff that a PI generally doesn't see. When i say tiny, I'm not talking 1/2 gram, I'm talking 1/2 grain. The garrett Infinium I had could see a 3 grain 'nugget', with the stock coil, at about 1".. so the sensitivity to large stuff is kinda moot. The MXT I had up in Alaska could gett down to 1/3 grain, with the 5x10" DD, at about 1/2". I wasn't able to test the X70 on anything smaller than 3 grains, so I can't really say how it would do. ..Willy.