Ive tried one... It works great on brass and buttons and somewhat ok on bullets.... If you want to dig a lot of nails. It's very, very tough to distinguish a nail from a bullet with a TDI whereas it's very easy to do with the GPX.
I've recently purchased a new machine that I really enjoy using. My results have improved dramatically, because now I get a lot wetter, it's a pleasure to carry where ever I go and less discrimination is applied during use.
It's tones are the best method of target identification that I have ever used. In other words, it discriminates, but it still lets you know something is there.
It runs deep, and for the first time, I have found tiny tiny gold with it, both in coin, and now in natural form.
Until now, I've been working all summer, so I really have not had that much time to use it.
My opinions are based on about 25 hours worth of very recent use.
It's really well-thought-out. A lot of time and effort went into putting it together.
Here's the catch. It goes with me everywhere.
I've always wondered, "why do these things always take the form of a weed wacker?"
Gardeners have pick up trucks, I drive a car.
It's odd because no one else really seems to really care that they're driving around with a hedge trimmer in their trunk, or they have to walk to their choice of location carrying what looks like a Geiger counter.
My new Detector telescopes and folds and it's worth at least a third of what I paid for it (ok, ok, I'll stop)
Thiis is huge, because since they've torn up Benito Jarez, (the main street going into and out of Tijuana) for the past few days, I've simply pulled over, walked over to the freshly exposed gravel road bed that has not seen the sun in 90 years and have made some of the most amazing finds I have made since beginning the hobby a few years ago.
In this particular case you really can't sit there doing that very long until someone comes along and asks you for a bribe, so I have the huge advantage of being able to sit there long enough until I sense that I need to go, then simply telescope it closed, get back into my car, and lay it down in the front seat right next to me, before driving off.
(Mexico used to commonly use these tiny little gold coins up until the 20s or 30s, they are tiny, and apparently lots of people used to carry and also lose them)
There are several distinct advantages to all this.
First of all they would not have let me take the hedge trimmer across the border without paying import tax on it unless it was completely disassembled.
Another reason is is just too much of a pain in the axx to do it every time I cross "la frontera".
Similarly, if I just want to detect a city park in San Diego after coming back from a jog, I just take it out of a regular size backpack and have at it for 15 or 20 minutes.
Someone really respected their client end user, and the interesting thing is it was probably all an accident and business as usual because from the manufacturer perspective they really didn't have me in mind at all.
