I swing a T2, a close cousin to the F75. Before I sent it in for the upgrade. I could really only use the T2 in rural, relic-hunting. With the DST, I can actually use it in the city if need be.
The T2 isn't really labelled a coin-shooter for sure. It's pedigree is in relic-hunting. If you have the NEL Sharpshooter or use the 5" I don't see why one couldn't coin shoot with it. My T2 screamed out on a 6" deep Barber dime in the middle of a huge cow pasture. The key, like said before, is not to be afraid to really lower the sensitivity. In machines like the F75 and the T2 it doesn't really translate into a huge loss of depth, like many other machines.