"In my opinion, both of the earlier PI and VLF multifrequency detectors (Infinium LS and Minelab Excalibur) are better for shallow water hunting and essential for diving because their proven ruggedness."
Oh, ok. I read your statement as being the pretty strong opinion of a mind made up.
I have extensive knowledge of the Infinium and a passing familiarity of the Excalibur. Yet I am taking neither to Hawaii next month in favor of the ATX and CTX. My reason is pretty simple. I like learning about new detectors.
If I was really determined to use a VLF a lot in the surf I would go with an Excalibur or CZ-20/21. The CTX is a tad to dainty for the rough stuff. So I will be babying it in Hawaii but it will serve the purpose, which is mainly to backup the ATX, just in case.
PI vs VLF is kind of simple. In places like Hawaii, with highly mineralized volcanic sand and salt water, VLF detectors lack punch. As in when I use them they feel gutless. All detecting is site specific, and no detector is best in all places. Leading to silly this vs that on the Internet when the fact is all detectors have a time and place. The trick is to recognize and use what works best at any specific location. But you also have to account for personal style and taste. Basically, most people are adverse to digging trash targets. The more adverse they are, the more they should use a VLF. The whole point of a VLF is to pass targets.
Some of those targets are good. Some people like me have an extremely high tolerance for digging junk. Does not bother me a bit if the digging is easy. I love the actual process of metal detecting and so if in my opinion the site is good, I like to remove all targets. Nothing gives me a warm fuzzy than feeling like when I am done you are going to come along and find nothing that goes beep. Nothing. Nada. If you find a hair pin or a pull tab I was being sloppy, which irritates me. My goal is A. Identify a site worth detecting and B. Completely sanitize it of targets.
I like trash and I like people using discrimination. It means there is stuff left for me to detect. It is simply a style and type of detecting you are into or not, and most people are not. I am fine with that. The only time I get discrimination happy is turf digging, and I do love my CTX 3030 for cherry picking turf.
Somebody will probably chime in with how their place is so trashy and you just can't use a PI and so forth and all I can say is no worries, use whatever works best for you. If you like using discrimination and it makes your day more pleasant, then by all means. If your time is limited, and you need to cherry pick, by all means use a VLF. There are all kinds of reasons to use a VLF, number one being to pass targets. If you want to pass targets, use a VLF. I use VLFs where digging is very difficult or when I am tired or just for fun.
But if a site in my opinion is worth detecting, it generally is worth sanitizing clean of targets. I believe trash hides targets. Again, that is just me, it is how I like to detect, so I like PI detectors. No doubt it is all the gold nugget detecting I do. I have seen VLF detectors and people using discrimination miss so much gold it would make your head spin. My two biggest nuggets this year, a 6.5 oz and 2.3 oz, were out of people's dig holes! They acquired the target, took a dig, checked it again, called it junk, and walked. I dig buckets full of junk, but I do dig a lot of gold also, from places other people do not even detect. "No gold, too much junk". Yeah, right.
Remember that spot that produced good targets, but now a VLF finds nothing good any more? Time for a new spot or a PI.
So for me it is more about the Infinium vs the ATX and jury is out. For dry land the ATX wins hands down. A dramatic improvement over the Infinium.
Gold and Silver with the New Garrett ATX Metal Detector and
Gold Nugget Detecting with the Garrett ATX Metal Detector For Hawaii I am hopeful but I will not know until the end of January if the ATX is finally going to be the machine I have been waiting for to solve my Hawaii riddle. The Infinium was close but it is one unstable rough riding bronco in Hawaii. I am hoping the ATX smooths things out somewhat.