Okay, I'm going to try to explain it all one more time, and hopefully everyone will understand.
I have no problem with NEL making coils for a variety of metal detectors. Most coils are nothing all that special, as they are basically just antennas. However, Minelab, with the Xterra line, opened up a new world of all digital detectors, and the coils employed are no longer simple copper windings inside an epoxy filled plastic housing. The coils now contain proprietary technology that allow the coils to communicate in a two-way information flow with the control box.
My beef with NEL is an ethical one as much as anything. They stole the technology via dissection & reverse engineering. It is intellectual theft! Though to a lesser degree, it's not that different than when the Chinese stole U.S. guided missile technology back when Clinton was POTUS. Was that okay? How about you put yourself in Minelab's position for a minute. How would you like to spend thousands and thousands of dollars hiring top physicists and developing new technology only to have thieves capitalize off your time, money, and effort investment?
Beyond that, there is the performance aspect. While I can't be too specific due to NDA, I can assure you that NEL does NOT have access to programming information necessary for their coils to operate at peak performance. I am aware of at least one mistake that Minelab made that they had to patch, and without the closely guarded details of that anomaly it is impossible to produce optimally performing coils. Coiltek wasn't even aware of it until one batch of coils had been sent out to field testers that we ended up rejecting due to the issue.
Then add to that that Minelab even went so far as to make changes in their firmware specifically to thwart the use of unauthorized coils. To counter that move by Minelab the thieves had to come up with a button pushing sequence on startup to FORCE the control box to accept it. Please explain how this is a good idea, and/or how it makes for a coil that is just as good or better than the authorized coils available......I'll wait.
Back before Coiltek was given the green light to develop and produce Xterra coils and we only had 7 Minelab coils to choose from, I felt a lot like you do. But, Randy made me see the truth of the matter, we (many of us) pressured Minelab to expand the line of available coils, and he got me directly involved with the whole process. We helped bring new coils to the market, and they are superior!
It was Randy's policy to disallow discussion of clandestine coils (with Guv's approval), and I maintain that policy, because like Randy I have no desire to reward thieves.