I owned the latest version for a few weeks, found the emi shield worked a treat, however I sold it as I was offered more than I paid for it. Impressive as boost and shield was it actually wasn't enough to convince me to hold on to it. I did a few comparisons and recorded the results. What I found with boost was on mild ground there was a difference that was noteworthy, but its rare to pull objects beyond the capabilities of my original F75. In Europe or possibly the Americas where finds could be millenia old and buried it would make a lot of sense but except in a few specialist areas that I might get to it wasn't needed.
I doubt it will be your favourite machine but when (not if, for you) you mate it you will find it has some real strong points. It can hit crazy depths, excellent notching, reliable id, and awesome recovery. Used wide open its very capable. Big bonus is weight, the deus has it covered but its a long hunt machine.
I use energiser in mine, should get every minute of 40 hours out of it.