The multi-frequency ML ad sold many machines before the single frequency Xterras came into view.
I bought an XS based on an ad that lied to me and I had no way to verify the machine did what the ad claimed to do. I enjoyed the machine and at $1000.00, it was quite a purchase. I no longer use it because it is a slow machine and I am more inclined in some hunts to move faster.
I am now more selective in my purchases and the latest on the market is not always the best for me. All machines work. Single frequency machines are getting the targets for the same reason the multi-frequency units worked: software and signal processing. Having more simultaneous frequencies would be the industry standard at some point if it were a true improvement in the evolution of technology, but that is not the case. Better design in signal processing and the needed hardware is where it is at. I don't care if you are looking for land mines, coins, nuggets or iron relics. Processing the information is what makes these things go round.
Who had a hand in the design? How long have they worked at this science to derive a solution? Are they original, innovative or have sexy advertising? Both?
The American brands sell on factual statements and the trust of their customers.
Ask yourself why one machine or brand is attractive to you.
There are not many claims from 1st Texas so they must not be marketing buzzsaws. Maybe they are geeky technical types that wasted years in college on geeky degrees. Same for the other small potato's brands here in the States.
They need to get modern and have sexy ads with BIG FAT CLAIMS. Lots of colored graphics and arrows.
P.T. Barnum said, "Sell the sizzle, not the stake"
Sunny Jim