After using a lot of PI units for salt water beach hunting, the Infinium is the only one I have left. It has found the best target I ever dug on the beach.
Being able to mount it on a straight shaft, change coils, fit it with a pair of GG Underwaters, tone ID and being waterproof leaves it in a class by itself in my opinion.
I mainly use the big Garrett mono coil on it.
I think the main reason it never really took off is that there are other units more specific for gold nugget hunting, and the same for coin shooters, relic hunters and beach hunters. In addition, setting up the Infinium to run on a salt water beach takes a bit of learning but once you go through the frequency check, get the unit tuned to the beach conditions for a smooth operation by adjusting the threshold and discrimination settings and allowing the unit to ground balance, its a really great salt water beach hunter. You just have to work it slow and listen. Shallow nails, bobby pins, wire will double hit, but so will some shallow chains. PI hunting really is a dig all mindset though so I dig all targets, even the double hits, when using the Infinium. I just pick my spots as to where to hunt. Iron laden beach sites....it's not a good fit.
Shoot, you can put the 8 inch mono coil on it and actually coin hunt by only digging the low/high tone targets. You will dig some iron and not dig nickels that way but it can be done.
Sad to see it being discontinued but that's the way things go I guess when a product does not sell well.
I won't ever get rid of mine.