This is one of the best topics on this site. Elmy always gave straight up, from long experience, truth filled advice.
Two quotes from Elmy that were right on the mark as far as this topic- Is the Etrac really the best coin detector?
"Some just don't understand the etrac/ctx 3030/v3i and they are not a good fit for them. Some don't get the nox and I am sure some won't like the legend or the deus 2.
Some want to run with a detector , some want to crawl along at a snail's pace. Some detectors are just too heavy. If it was the best detector to find coins ever and you just did not like the way it runs or the way it feels in your hands or sounds then it can't be the best ever to you. If it was that easy , everyone would drive the same model of a car."
And
"I do believe ground conditions are a big factor. Most of my best finds are 10+ inches in NW OHIO."
That second quote sums up my experience with the Etrac and CTX 3030. I used an Etrac for several years here since it was the only less than 4 lbs detector that sort of worked in my area. Here in the Denver area these two detectors struggle with the mineralization and have problems accurately identifying mid depth to deeper targets in the 6 to 10" range, especially low and mid conductor targets. I could drive 30 miles east or north of Denver and that problem was not really an issue. Drive 30 miles west or south of Denver and these detectors were basically unusable for even 4" deep targets unless I was digging everything.
That is where Minelab's Multi IQ technology that is in the Vanquish series especially the 60 series that can be user ground balanced, X-Terra Elite, Equinox series and Manticore along with Nokta's Score and Legend detectors made a huge difference as far as overall depth with accurate information, recovery speed, ground handling in general and the ability to detect targets of any conductivity very accurately even when deep=10+ inches.
Sure, Etrac and CTX 3030 could work well in some areas here. As soon as mineralization became an issue, it was time to switch to a Multi IQ type detector here.
Eventually I sold my Etrac and just stuck with Multi IQ detectors because they were much lighter, easier to setup, faster recovery speed and I knew from experience that they would work well just about everywhere I took them and didn't have to wonder if my FBS detector was going to work at one location and then just do poorly at another.