in an ideal environment and with all targets in an ideal positron, not too deep and not masked by any other nearby metal object, and with uniform ground, those targets made up on non-ferrous metals and with a high percentage of a primary metal, will usually "read" or "ID" quite consistently.
In those cases you can make good use of any make/model Target ID system, and the X-Terra 70's 28 notch segments can be put to good use to accept and reject certain targets as desired.
However, as Randy also pointed out, not all targets will be of a nice and proper metal make-up, not all ground conditions will be favorable or uniform, and there are too many chances for target masking from trash, other good targets, etc., etc.
In short, you need to master your detector and that means not just knowing what it can do, but when it can and when it can't. In situations when it can't, you need to recover more targets (use less discrimination) and not rely on TID lock-on results (dig the 'iffy' responders).
My question is this. If I run in all metal mode and "dig it all" why have all the bells and whistles?... An overused term, ... "bells and whistles" ... it really isn't fitting for the X-Terra 70 or XLT or any other make and model. What some models have are a lot of features/functions and it is certain that not everyone will understand them, and in some cases, with some models, they might be considered excess or useless. However, in the case of the X-Terra 70, all of the functions it provides are useful, or at least can be in certain applications.
You will have the additional features for those times and situations when they are needed or wanted.
If I GB like I should, and run my sens like I should. Do I still run in all metal?... That's up to you but, like Randy and some other dedicated detectorists, I generally search in All Metal with the X-Terra 70 like I do with most any make and model. Why? Because you can get better depth and you will also hear targets a little better that you sweep close to, allowing you to redirect your sweep to check them out. Also, I like to know of there are some iron targets at a site that can cause masking of a nearby desirable target. By hunting in All Metal you will know that iron is present, or any other type of metal, and that let's me make a metal note of the conditions and listen for questionable audio responses.
As a newb I really am just wanting a honest opinion. I want to find coins, jewelery (I hope), maybe even a relic if possible. Will these items show up in all metal?... Yep!
EVERYTHING metal is going to respond if you hunt in All Metal, which is still a motion-based, non-rejecting motion discriminate mode.
Personally, I favor the two-tone audio ID option for most searches/ I like to "hear it all" and then make a decision based on the responses I get.
Naturally, there will be times when I limit the amount of iron acceptance. For example, when I work a couple of my favorite ghost towns, one of which I have had hunted since May 4th of 1969, I know them well and the iron trash is abundant. I like to use a minimum amount of rejection at them, and with the X-Terra 70 that meant rejecting -8, -6 and -4. I accept -2 on up in most of these types of settings.
The X-Terra 70 allows you reasonable good adjustment to work most any site, and when the new 6" coils get in everyone's arsenals (and probably used 90% of the time) I think we're going to see the X-Terra 70 finally be accepted by more hobbyists.
Congratulations on your new X-Terra 70 choice. Please, take the time to really learn it, and your hunting environments, and I'm sure you will really enjoy your new detector.
Monte