Digger, you ask an honest question:
"
IF what you say about the Explorer II is as claimed, then why hasn't it taken the detector market by storm? "
The answer is, that while it's true that the Exp. retains TID to great depths, yet it's not easy to master it. The "market", that you refer to, will invariably pick up the machine, and hate it. The reason is, that it's very tone/sound specific. It's not just a "beep" or "no beep" machine. You have to learn the tooty-fluty. For example: I too heard such claims, and saw guys "bringing in the silver" from tired worked-out parks. So I too tried it (borrowed someone's Explorer back when they first were coming out 8 or so years ago). I took it to a worked out park, and had the attitude "if what they're saying is true, then I'll be able to effortlessly pull silver out", right? But all it was was a chorus of sick geese in the sounds.
It wasn't till a year later, when I met up with a proficient user, in a park where the silver didn't START till 7" down, that I became a believer. He pointed out a few signals, and told me they'd be silver or wheaties or whatever. I swung over them with my Whites, in EVERY CONCEIVABLE setting, rebalance, direction, etc.... I had to admit, I wouldn't have heard them, if they hadn't been pointed out to me.
So again, I ran out and got one to try. And again, I pulled my hair out thinking "these guys are nuts!". It wasn't till I met up with that proficient user, and had him point out some of these deep turf signals, that the "lights went on". Once I heard, side by side, comparisons between what he'd chase, and what he'd pass, did it make sense. No amount of printed instructions can convey such audio lessons. It simply can't be done. It has to be heard and shown, since it is is so sound specific. Printed text can not convey a sound, swing speed, etc....
So there's your answer as to why it's not "taking the market by storm". The average person just can not make it work like that, unless he's either gone through this school of hard knocks, and/or been shown by a proficient user (not just a sand-box hunter). Thus the average person gravitates towards the easier to interpret beep-or-no-beep machines. Nothing wrong with that, mind you. But just answering your question
