Terry, in the age of the internet my suggestion of test driving a new machine isn't so easy anymore. Three dealers around here have gone out of business. I watched the entire video on youtube, not the link, and yes, what's with the TP and the paper blob from hell on the right...
I place ZERO faith in test gardens, minus 20 faith in youtube videos and minus 100 faith in air tests! Air tests are for, well, forget it. Unless when you detect the targets hover in the air.
That said, he makes some good points in his video. What kind of machine you have does not necessarily mean you will find nice stuff. Some days it just doesn't matter. Every machine has pluses and minuses.
The stuff has to be there to begin with. That's rule #1. Rule #2 is you have to have a machine that works. Rule #3 is you have to dig some iffy signals.
I have used most of the machines he mentioned with the exception of the Nokta units. No one around here has any, so no ability to test drive one.
There are advantages and disadvantages. Pricewise the XP Deus with HF coil is most expensive. Vferrari and I did a head to head in the very bad Virginia red dirt. The Deus was about 20% better as it got a few more targets than when Hugh used the Equinox 800. We were almost stepping on each other, it was a great day. The AT pro my buddy had at the same site just wouldn't cut it. Interestingly enough, the Tesoro Vaquero would pound the site and go deep. Go figure.
The Equinox series is next price wise, the price just went up this month. Just don't get it really wet. And be sure to spend another $100 on an after market shaft. The build quality is less than the Deus judging from the one I had. Great engineering, not so much on the build.
Then the AT series. At least the Max and Pro. Lower price than Equinox 800. They are built well and in moderate ground before I got my Deus my buddy would hand me my butt on a platter using his Pro.
So...its back to Rules #1, #2, and #3. And your pocketbook. I saw a guy, literally 20 feet from me pull a valuable Spanish coin off a beach with a cheap Radio Shack unit a few years ago. I was so jealous...I finally got my share. He just had to get that coil over the target.