I started detecting with a Ace 250 many years ago....great detector....it paid for itself many times over. It was cheap, light, and easy to use. Once I learned that gold rings hit in the pull tab range and most people set their detectors to reject pull tabs, I started digging every target in the old swimming holes I was detecting. The Ace was easy to use and strong I could locate a target fast, have it dug and pinpointed, fill the hole and be on to the next hole before most people could even decide if they wanted to dig or not. Most long days would yield a near full gallon bag of pull tabs, bottle tops, gum rappers, and can slaw. In my front pocket would be earrings, broken necklace parts, toe rings, wedding bands, silver, and watches, etc. It takes a lot of hard works but for real I think its a numbers game, no matter what detector you are using....The more targets you find and dig......The more stuff you find, be it trash or treasure.....A full basket is always a full basket. After years with the Ace I decided that I wanted (MORE POWER) so I ended up with the Whites (DFX).....after a much longer learning curve then the Ace I also learned to love her. I like whites detectors because of the service you get when you call, I like how the detectors are built strong and last. It's very easy to find parts and upgrades in almost every state. After years with DFX it slowly became my new right hand......The Ace was still my go to machine for easy digging and swimming hole hunting but the Ace could not keep up out in the woods or in large plowed fields relic hunting civil war, or historic school sites. I could find deep silver targets with my DFX that my Ace couldn't even smell. After years with my DFX I decided I needed (MORE POWER) The choice was easy for me to pick the Whites V3I. Everything was the same as my DFX just better...Most of my old DD coils work just the same...most.....and the set up is same........I feel like my V3I comes really close to telling me what is in the ground...However, close is also what makes pull tabs and gold rings smell so much alike. My V3I is really nice it has all the bells and Whistles but to tell the truth when I am hunting a historic school site deep in the woods and I get a faint hit that sounds questionable I don't flip through six different screens to see how it reads on one of my many graphs I close my eyes swing over spot a few times to get the sound to repeat and then I default back to my old ACE 250 days......I dig....that's the only real way to determine what the detector is telling you.....I would say buying a high end metal detector is no different then buying a high end hunting rifle....find the one that feels good in your hand , that is easy for you to use, make sure the caliber is close to game you are hunting, buy it and get to know it. When it comes down to it all the money and brands in the world is not going to put rounds on target......That is up to the user. I love my V3i because I know it....I'm sure a guy just like me with the same amount of time in the field would give my V3I a run for its money with a Dues, Mine Lab, 3030 or ACE 250. Depends on the operator and the location.
Hope that helps.