For
SOME hobbyists who strictly coin shoot, they will gain a good degree of frustration because the X-Terra 70 has a Prospecting mode and enough added adjustment features that they will feel 'challenged' to learn them. The intimidation of what it offers will, quite honestly, be too much for quite a few.
While addressing the negative aspects of an "upgrade", so to speak, we can't forget that many coin hunter simply want to recover coins. They want enough discrimination and notching ability to eliminate the more common trash, and they also want a good target to 'lock-on' more regularly or consistently. The X-Terra 50 can do that with it's 18 segment notch discrimination.
Now, for some people, the X-Terra 30's 3-tone audio is more appealing than the X-Terra 50's 4-tone audio, while others like to have a little more definition with the higher conductive coins the X-Terra 50 provides.
OTHERS, who I consider to be more experienced detectorists, will find the added features of the X-Terra 70 worth the extra cost, even if they are very dedicated to coin & jewelry hunting and do not plan to nugget hunt or relic hunt. The X-Terra 70's factory default is for a 4-tone audio similar to the X-Terra 50, but the user can select a 3-tone audio that's similar to the X-Terra 30, or a single tone audio. For those who don't mine a little extra "music" as they coin hunt, the "Multiple Tone" feature is just for them.
The X-Terra 70 also bumps up the number of Target ID adjustment segments, or notches, from 18 to 28. This can be good if you want to be a little more picky about fine-tuning some trash to reject, but it can maybe be a little annoying to those who anticipate more lock-on and less jumpy responses.
The Ground Balance on the X-Terra 50 is a breeze to adjust, but there are some who just seem to struggle with GB. For them, the 'Track' feature is a certain help and it seems to work rather quickly and accurately.
As for coils and operating frequencies, I am still of the opinion that the 7.5 kHz coil/frequency will be the better all-purpose for the majority of hunter. But a more dedicated jewelry hunter, like a nugget hunter, is going to appreciate the 18.75 kHz coil. For common coin hunting at most parks and schools in 'average' ground, the 7.5 kHz ought to do. I am looking forward to the 3 kHz coil, however, for some serious "silver shooting" at our older parks and schools and parking strips due to our high mineralization, and the deeper old silver that might still be around after all the decades these sites have been hard hunted.
I feel an important requirement for those considering an X-Terra 70 is that they must have more patience and be willing to devote more time and effort to really learn what it has to offer and to reach a 'comfort level' with the features and how all the functions are accessed and how they relate.
I know that my wife will NOT use the X-Terra 70 because she felt it was too confusing. I hunt with a few good friends who like what they use, and have an interest in an X-Terra 50, but mainly because the '30' doesn't work well around here. They would be willing to learn how to GB in order to enjoy what it provides, but many of them I don't think would be comfortable with an X-Terra 70 until maybe a year from now. I guess I have some friends who are just slow learners?
When a smaller coil in 7.5 kHz comes out it will probably be assigned full-time duty on my X-Terra 50 for quick work of playground woodchip and sand lots, as well as be one I'll often grab for renovation work.
There's no doubt in my mind already that my X-Terra 70 is going to be my primary-use unit. This past several months, hunting with the X-Terra 50 and two of my other favorite models, my modified IDX Pro and Shadow X5, I have noted some of what I would like to see in a new detector and how I would like to see it. The X-Terra 70 is quite close, scary close, to what I have considered to be an ideal mix.
I am smart enough to know that there is no 'perfect' detector made, and that includes the X-Terra 70, but it certainly appears to pretty darn close to perfection for most of my hunting needs & wants.
Happy Hunting with which ever X-Terra you have in your hand.
Monte