I have only dug one, one year ago, almost to the day. It was 8.5" deep and actually read into the negative numbers, and then occasionally bouncing up to around 33 VDI on my White's DFX. (Make sure you are accepting into the negative numbers, people!)
The coin will show up as a pull tab on your detector, so if you are not digging the pull tabs you are not going to dig one of these, or an early Indian Head. "Coin Mode" will miss this coin as well on most detectors.
Interestingly enough (or not!) this coin was found just off the Wharton Tract. Joseph Wharton "lobbied" for the production of the Eagle Cent since he owned all of the nickel mines in PA.

