Well, my impulse buying self just went and ordered one, within minutes of first hearing about them.
Was put off by the $99 plus shipping cost, until I learned how much they were just months ago.
I got the absolute perfect spot to test its depth, an old lot where I pulled 100 + old coins over a 3 year period, milked it for what it was worth with the stock coil, I am 100% certain there are more coins deeper than the 5 inches or so I was able to get.
Am also 100% certain no one else has ever hit this spot, and it might well be covered with asphalt before too long.
I've spent dozens of hours crisscrossing in various patters with slow, overlapping sweeps.
I still get the occasional wheatie digging iffy signals, but if this coil starts producing hits at this lot, I will be an instant believer.