PI is not an upgrade... re-think that,
I think it is if you want to get it all - I got my Pi in 1995 and went to bunch of spots - bunch of guys said were
cleaned out and had stopped going to - went in there with pI and got a lot of gold and silver 1 1/2 feet and deeper with it
but see 99% of hunters are spoiled by discrim. - I started out with TR machines that had no discrim. and dug it all for yrs
and even on land I went to schools and parks thought to be cleaned out by guys with high priced discriminating machines and
I would slow down and boost my sensitivity and get all kinds of old stuff deep they missed because they cranked their discrimination
and lost depth - or junk masked good stuff with - under or next to trash
if I were him - I'd try and find someone with an old Pi and see if they'd let him try it
I used mine for 10yrs and could tell you when I had a nail or bobby pin or a deep silver or gold target - its all about learning your machine
but I still dug it all and that's how I learned whats what -- but that's me ---I still hunt in all metal and try to get it all
in a perfect world I wish all hunters used PIs or hunted in all metal and dug it all - then all we'd have to worry about is the fresh junk drops