I also would use Tone ID quite often.
I also know when to NOT use Tone ID.
Coins on ground or in holes by nails and such might produce mixed audio tones. Yes, you can hear some differences, but they are not a solid and always accurate tone for the coin.
Yes, I, too, can usually hear the difference between a clad and silver dime or clad and silver quarter ... when conditions are favorable and there's no masking.
I know a lot of people who do NOT like the Tone ID because it spans such a wide range. We all have different hearing abilities and tolerance levels for things.
If you can't hear the difference between nickels and silver with an Explorer, then you didn't use the Explorer enough to learn it.
The DFX is quality built, but the performanced just isn't there for some of us in our ground environments. The MXT, however, is easier to use, and some of us prefer it a lot over the DFX or XLT for a number of reasons.
I've taken an XLT into a small spot I had hunted with an MXT, using the same size coil on each, and the XLT popped a nice silver Merc. and Rosie for me that gave a better audio response. If not, I would have dug them with the MXT.
However, I have used the MXT enough side-by-sde with both XLT's and DFX's and overall have found the MXT to provide the best depth-of-detection of the three. The DFX has a lot of adjustment features, BUT is is still based on the XLT's faster sweep platform and you can not tinker with the DFX's controls and make it work like the MXT.
Two different types of detectors. If the Matrix M6 isn't a vast improvement in field performance for coin hunting over the MXT, and if they don't plan on making an M7 to replace the MXT based upon the M6 but adding back the versatile features of the MXT, then I might just get another MXT by springtime and before an Arizona nugget hunting trip. I know I won't be getting another DFX.
The end.
Monte