I've had the unit since Feb and really enjoy it. Re VID numbers and overall usage, I have a fair fix (that is fairly predictable results) on quarters, nickels, half dollars, wheat backs, Indian heads, but nothing stumps me more than the memorial cent vrs the dime. There are times I say OK it is a dime and dig, and lo it is a mem cent, and conversely, this is definitely a mem cent, and dig, but no it is a dime. Ill admit for silver I see numbers in the 80's and higher, but even than the mem cent might stump me there. One thing that seems perhaps a little more consistent is a dime, when it locks on , the ID number spread, seems to vary less, while the penny locking on might jump around more with a wider spread of numbers, When pinpointing Im hearing a difference, that the penny being a more low pitched whine or grunt, is that your experience? So do you all who have been using the units a while have suggestions for discerning the difference or reliable numbers you trust for the dimes vrs the mem cent in re dig or not to dig decisions? I know this is not always an exact science and I dig a lot of questionable, it just sometimes , I have a limited time to be out there, and want to make the most of the time, etc. Thanks for any input, CO