A heavily mineralized area can produce ground responses that affect the manner that the detector usually reads the target. In other words, the mineralization of the spot you hunt today might show you a different TID on a particular target, as compared to a lesser mineralized site you hunted last week. So, if you "hunt by the numbers" or have your notches set to reject segments adjacent to "keepers", high areas of mineralization could cause you to pass up good targets that you think are trash. In a nutshell, TID stability incorporates a filtering mode which provides a more consistent target ID in heavily mineralized conditions.
Most of my hunting is done in moderate soil conditions. As such, I find the concentric coils, without TID Stabilization, works very well. If I get into an area with "more than normal" mineralization, I have the option of using the TID stabilization or using a DD coil. The end result is similar for me in this part of the Country. However, for those hunting in areas where the highly mineralized soil conditions warrant a DD coil for optimum performance, you may find that you have the most accurate TID information while using both a DD coil and TID Stabilization. HH Randy