Hi Tom,
I can certainly understand your answer Tom, and I would have a tendency to agree with you to a point. If a person expects to jump out of a car and instantly start hunting with a super quiet machine, then this PI isn't for them. It could or would get frustrating until you know the tricks. If a person doesn't know what to expect, or the best place to use this PI, or not willing to adapt or spend some serious time with it, then yes, one should avoid using a non ground balancing PI if only a mono coil is available.
When I first tried the a non ground balancing PI, it was the unit before the GQ, the beachscan. When I first tried it, I didn't like it that much because I was used to using a VLF with decent ground canceling, so it was sort of like going backwards, since the PI did respond to the ground quite strongly in many areas and there wasn't much I could do, or so it seemed that way.
However, after spending some time with it, and once I knew what to expect and how to minimize problems, I started to change my mind. What really helped was I noticed the PI seemed to love areas the VLF's hated, and it didn't respond to some of the rocks or black sand that drove my VLF fits.
Also, I found many areas where the PI didn't generate much of a ground signal, and noticed why, so I would look for these areas to hunt more often. As I said, it seemed that areas that were the worst for VLF's and gave the VLF fits, were the places where the PI was the quietest. So, I could now easily hunt areas that were difficult before.
Finally, after using it for some time and going through the learning curve, I actually prefered the PI in most areas even though it did respond to the ground in many of them. Part of this reasoning was I could hunt areas with the PI with ease that were almost impossible to hunt with a VLF, and the PI simply seemed to go deeper.
At the time I was mainly hunting the Gold Basin area and on the flats, you could run into some really bad hotrocks that would cause about any VLF to scream once you hit them. These rocks would or could cover fairly large areas. I know, I tried several different VLFs there over them and finally would just try to avoid the areas. That was until I tried the Beachscan, and it worked great over the same area and had almost no ground signal. So, instead of trying to avoid these spots, I would look for them to hunt with the PI. I would usually get a strong response once I came off the piles of rocks and hit the red ground, but if I raised my coil and increased the autotune speed to max (something I had added) at that time, the ground signal was much less of a problem and I knew what it was.
So, I just learned to use a non ground balancing PI and actually didn't mind, once I knew the tricks of what I had to do to minimize the ground signals. I prefered it over my VLF's which included, the GB 2, the XT 18000, the Tesoro LST, the Tesoro Lobo, and a couple of others.
This movement from a Gold hunting VLF to a non ground balancing PI was as distinct as going from a typical coin hunting VLF to a gold hunting VLF. There is a marked difference in how they respond when at or near max sensivity.
Now, I would probably agree with you today and caution a person that there is a definite learning curve to using a non ground balancing PI equipped with a mono coil. Does it still have a place where even it excels? The answer is yes, they will generally work very well in active stream beds, over most hotrocks, or over areas of concentrated black sand with little or no ground response. Hit a water washed area where most of the clay has been washed away and you will generally have a very quiet detector and not experience much of a ground signal, if any, until you hit the spots of clay.
Here in Colordo, I can hunt the active stream beds with ease and the non ground balance PI is usually quiet as a church mouse even when using a mono coil. Walk up the sides of the banks into areas of plain dirt and now, the PI becomes quite noisy if it has a mono coil. There will be some ground signals with a DD coil also, but not nearly as bad as with a mono coil.
Reg