Just be prepared to hate it for a while until you learn to love what it's saying to you. Of all the machines I owned over the years, I'd say the Sovereign was the most "different", and that includes compared to my Minelab Explorers. At first I wasn't sure I could adjust to the super long tone responses on targets. It made coins sound as big as the top of pop cans. Was really hard to adjust to that the most, and didn't see how this thing was possibly gong to separate with that kind of long-ish response, but now I see it'll snipe coins from right up against iron and other trash, especially if you are using a quality DD coil with a sharp DD line. That super long response of the Sovereign is now I feel one of it's greatest assets, so in a sense what I thought was going to be it's major weakness turned out to be one of the things I love most about it. For one, it's got long detailed "words" about targets like the best of the old analog units, yet with the numerous tone alerts of a Minelab. For that reason alone, it's truly unique among detectors. Also, the more "robust" response makes it very hard to miss a high tone mixed in iron or also at fringe depths. It'll speak up loud and clear to you and say "HEY! Better pay attention here..."
These days I've changed my views on how important recovery speed is to unmasking. So long as you don't swing the coil like you are killing snakes, a quality DD coil will snipe out silver in trash or iron with the best of them on this machine. Also, having owned fast and slow machines, I feel that it's slower recovery speed (a non-issue for me now in terms of unmasking...would never have thunk that a few years back) gives me more ability to hover over and really drink in a good look at super deep fringe targets, without the machine trying to reset on me and cut the look short. Also, many fast machines will not let you slow down and work within heavy trash intensely without costing you depth or stability or ID quality. With the Sovereign I can practically stand in one spot and just fish around all that iron or other junk trying to sniff out some keepers. I feel this is one of the key strengths of this machine at finding keepers at "dead" sites others have long since given up on.
The other hardest thing for me to get used to was not being able to hear iron in disc. I always ran my machines with nothing discriminated out and used my ears to judge and listen for high tones mixed in with the lows. I thought for sure having iron by default discriminated out would cost me some masking and make me miss stuff. Well, after about two years thus far of comparing badly masked coins in the field to another silver killer flagship model that was only using a tiny bit of iron rejection and otherwise an entirely open screen, both machines have seen these coins just as well as each other from all angles. Whatever angles gave one nulls or problems, were the exact same for the other.
Now, part of this I'm sure is the 12x10 I'm using. It's DD line seems so sharp to me that when I first slapped it on I would have swore the processor of the GT had been sped up if I didn't know otherwise. Why? Because in a sense it has been. The sharp DD line makes the GT more able to "see" and then "not see" a nail as it moves off it and onto a coin right up against it. Like cleanly turning a page from one to the other, the more sharp distinction between "there's the nail" and "there's the coin" makes the reaction time between one and the other more "crisp" or absolute, so in a sense you've found another way around lowering iron rejection.
IMO lowering iron rejection doesn't give me more ability to see a coin mixed with iron, but rather just lowers the lag time between going from "rejection mode" of the iron to "acceptance mode" of the coin. So I now think two ways to skin that cat- Either lower iron rejection or use a sharper DD line. Which is more important? I wouldn't assume to say either is, other than that a machine can't see what a coil can't see separately. But I will say that the end result between the two has pretty much been a wash from what I've seen so far.
Also, even the stock 10" Tornado is no slouch at depth or left/right separation. Not saying that. Awesome coil. Just that I feel the 12x10 seems to ehance all aspects of performance, depth, separation, and stability a bit more. By the way, the sharper DD line seems to make tones more "crisp" and "sharper" or more "treble like", which to my ears is a big plus for my particular hearing. To others they may prefer a more base type response, but I love how the 12x10 and even the Ultimate coil talk to me.
I liken it to hearing a noise on a cold winter day outside, where it seems more distinct and carries further, versus a hot muggy day where it kind of gets washed out as it travels through the air. Not even sure that's a reality, just that when I'm out in the cold any noises I hear seem to carry further with more detail and sharpness to them. Maybe it has something to do with the latent energy in the air (humidity) on hot summer days, like what happens to a sound when it travels through the water? Either way, that's the only way I can relate what the audio of the 12x10 and even the Ultimate is to my ears versus other coils I've compared them to.
That 8" solid white Coinsearch coil has many fans. Some guys even swear by it to this day as the best coil they ever used. For sure that's the one I'd want in terms of an original coil on a Sovereign prior to the Tornados that came out with the Elite...From what I've read and heard from others anyway...