Well, I did plenty of hunting on the beaches with the CZ-70 and then with the Sovereign Elite. The Elite made me know I wanted an Excal, so that's what I use now. I have had two awesome summers with the Excal and have done better with it than the CZ, though I did awesomely with the CZ as well. But this past summer I got a dozen diamond rings and a bunch of gold bands a few chains, and tons of clad. Best summer ever for me, so I have to stay with the Excal. I run mine in disc mode, for the tones, and at about 10 oclock manual on the sensitivity. I run a slight threshold. I run the volume loud.
As for the CZ, that's a big negatory on the Normal mode. It will false in the salt water and wet sand in Normal. Salt mode works great though. And if you're in ID mode, leave the sensitivity at 4. Running it at 4 gives you at least 95% of max depth and going to 6, 8, or 10 WILL result in falsing and WILL NOT result in much extra depth. Now if you prefer to hunt in "Autotune" which is no ID, all metal, then you can probably jack up the sens to 10 and even though the CZ is a non-threshold machine, it will be "tweaking" so hard that it WILL have a slight threshold (if you want to call it that) but it won't false. And that's where going above 4 pays. In ID mode, you're pissing into the wind above 4. I like to KNOW what I'm digging, so I run in ID. That way if I have a probable gold ring I can work harder in the incoming surf to recover same than I would if I had a probable bubbled up penny. Otherwise I would buy a PI machine, if I wanted to dig everything. Though that said, I DO still MOSTLY dig everything. But I MOSTLY know what it is before I dig it! If that makes sense.
But the CZ-70 is STILL the machine I would have if I could ONLY have ONE MACHINE. As it is, I DON'T only have to have one. So I use the Excal on the beach, the Explorer SE on land, and the CZ is my backup machine. But while the other two may eventually go for "the next big thing", the CZ-70 will NEVER go. Anybody who ever got rid of one probably lived to regret it. Because the truth is that while there may be one of two machines that excel at this or that, there are few that do EVERYTYHING as well as a CZ-70 does. Please let us know what you think about it after you have a few good hunts under your belt with it. I think the biggest mistake Fisher ever made was to stop making the CZ-70. I would have liked to see a CZ-75, maybe with a little more iron-rejection ability but it's actually quite nice the way it is.