Looks a nice detector but after reading the manual I'm not sure it will do any better here than it's predecessors.
I'll explain why a bit better.
A lot on another forum have been comparing the timings of the Minelab GPX5000 to the Axiom.
Even suggesting Garrett may be using lapsed patents. I don't think that's correct apart from the similar naming of the Axiom timings/modes they appear to me to be different altogether, especially as far as ground handling goes.
Axiom fine gold is reading like it's for smaller/shallow gold up to larger gold (similar in that respect to GPX5000 fine gold) but it stated it doesn't handle mineralisation as well as the Axiom Normal or Large modes. As you go up the modes to Normal & Large it suggests a loss in sensitivity to small targets (gold) but ground handling improves as does mid/large target detection.
The Minelab GPX series (4000/4500/5000) has a somewhat opposite effect. The smooth class timings (Sens Smooth, Enhance, Fine Gold) are all suited to high mineralisation while maintaining good sensitivity. Depth in some of the smooth timings can be the trade off but GPX Fine Gold can still punch deep in these highly mineralised areas too.
As you go into other GPX timings like Normal & Sharp they become less suited to high mineralisation (unusable in many cases with mono coils) but in milder areas can maintain some reasonable sensitivity but generally they have better depth over the smooth class timings on bigger/deeper gold.
To me (uneducated opinion only) the Axiom rather than employing complex new timings, or mirror Minelabs, has merged some good things from the ATX & Whites TDI together into a pretty good new package.
The timings more remind me of the Whites TDI pulse delay in combination with the conductivity setting though.
Fine Gold = Low - enhances low conductivity targets (small, specimen gold) & can subsequently enhance ground signals in high mineralisation. Pulse delay likely in low range (~10us).
Normal = Med - more enhances mid conductivity targets with some loss on low conductivity targets, especially very small gold, & can lessen any ground signal.
Pulse delay likely in low to med range (up to ~15us).
Large = High - enhances high conductivity targets (large) with loss of low + med conductivity target sensitivity & reduced susceptibility to ground mineralisation.
Pulse delay likely in med to high range (up to ~20us).
Salt possibly set in a Normal to Large type mode with a high pulse delay of ~25us very likely, used to counter salt water.
Of course I'm only speculating above but that's how the modes are reading to me in the manual.
Doesn't really appear to be much new as such, just a simplified or auto/preset digital version of old settings merged into these new modes?