The Equinox wouldn't be my first choice for working in iron on or near the surface, as has already been said an Orx of even a cheap GM1 would be more inline.
When detecting stubble or rolled ground etc your really only working the top 6" inches, what you miss this time around you'll get when the ground is turned over for the next years crops.
Personally i had thought of buying the Tarsacci for deep pasture detecting on hammered coins, but the Nox with 15" coil and excellent audio accuracy on low/mid conductors is hard to beat for that job.
Apparently there's a number of Tarsacci users already in the uk, but I've not seen or heard any reports.