Tim,
Nothing against you personally, but LRLs and MFDs are Pseudo Scientific Scams. The Arc Geo Logger is not controversial at all. It is based on sound scientific principle, and does nothing more than give a graphic representation of electrical signals input by a REAL metal detector.
I don't know you personally, and can't attest as to whether you REALLY believe LRLs and MFDs work, or whether you just sell them. If you REALLY believe they work, then as our Aussie friends say "Good on ya".
Before you go saying that I am a hater, let me say that I think there is something to dowsing. From there, I say that you either have the talent or you don't. No amount of "Pseudo Scientific" flibflabbery is going give you what you don't already possess.
As you can see from my Profile, I have a bunch of nice detectors (including two Mineoro LRLs). With the exception of the Mineoros, I don't have to believe in my metal detectors for them to work. It doesn't matter where the sun is in the sky. I don't have to be looking from the North facing South. It also doesn't matter if there is a disbeliever present for them to work. I turn them on, adjust the settings, make sure they are ground balanced, and when i walk over something metallic, they give signals.
.......and also don't think that I am just an LRL/MFD hater. I have a VERY open mind, and would ABSOLUTELY love to find something in that category that actually works. It's just that I have met many people who have spent a LOT of money on them, only to find out that they don't work as advertised. Take the Mineoro for instance. It is advertised as a "Gold Machine". But when I take it to a friend's jewelry store, the only time it gives a signal is when it is inside the walk-through metal detector. When it is in the store, with millions of dollars of gold and jewels-NOTHING! Maybe it was just overwhelmed. Maybe I just didn't believe hard enough. I know that if I walked in there, and turned on any one of my other Metal Detectors, they would go crazy.
See Tim, REAL treasure hunters use Metal Detectors (VLF, PI, and Two Box), Magnetometers, Laser Thermometers, Ground Penetrating Radar, Acoustic Location, some ground resistivity (much higher powered), satellite photography, aerial photography (hi res, infra-red color, etc), gas chromatography, mass spectroscopy, and yes....aircraft "sniffer" reports (basically aerial gas chromatography).
And those only come after research and wearing out boot leather.
Best-Mike