The Prism gets knock on this side of the pond as its the same basic performance whether you go for the base model or the top of range which is way expensive over here.
All the added features as you go up the range are not needed for our conditions whilst pure depth may be and a wide, wide discrimination option is vital. Your foil is our hammered coin, your iron is our late Empire Roman bronze. Thus on any of the XP models instead of having a knob that revolves 360 degrees to take discrimination reject from all metal through to ring pulls they have 360 degrees from all metal to iron reject, then you flick a switch to allow the same knob to be from iron through to foil.
The U.K. Tesoro's (often painted black to distinguish them) have their discrimination control altered so that instead of foil being rejected and a fraction later our silver hammered is lost, there is a considerable gap put between rejected items in the lower ranges.
The problem (or rather one of them) with buying a T2 over here at the moment are the software revisions taking place. I think its now on version 6 because in the U.S. you don't want to dig crown caps. If the revision allows the caps to be identified then the detector will work here (U.K.). If a change is made to automatically block the crown cap signal then it could make the machine not suitable for the British market. I don't know which approach they took with the software update but any change can totally change a detectors abilities with our most sort targets.
I suppose the ideal U.S. machine would be one that you could take to the park and it would reject all iron, foil and ringpulls and tell you the exact depth the wanted find is at. Our ideal is perfect iron rejection (which you could switch off or reduce because some iron is good) and great depth. Why would you need a depth reading or guess at I.D. because if its not iron we are going to dig it anyway ?