I run a 10x12 on my V3i (in the UK). It runs smoother than it did before I got the upgade as the new Salt Mode smoothes things out quite a lot (it's a non-v-nulled-coil issue). I can use Rx at 10, Sens at 80/60 on my soil which is full of iron and minerals. It is sharp and super-sensitive to the tiny hammered silver coins we have over here (I've had 22 since March) so I guess it would sing even louder and clearer on the big, thick coins you have over there! I also have a 12x15 SEF which runs just as well but, sadly, it is too heavy for me (I have an elbow problem) so I have to sell it (if anyone is interested!!).