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I kept a loose check on things. I vaguely recall someone revived the Teknetics brand after years of being a non-player. It seems that group has infused same technology into Fisher and perhaps Bounty Hunter and Garrett. All four brands have very lightweight and powerful machines.
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It seems most of current Whites are older style heavy machines, while everyone else is going lightweight. As boomers get older you would hope Whites would upgrade to accommodate the older folks out there. I'll try to get my hands on a TreasurePro to test, but the other options are might tempting. Saw below video on youtube of a Fisher F70 double-d 6 1/2" coil air testing a nickel at 13 inches! Things have changed! Not sure this one is best choice, but unbelievable compared to past machines.
Saw Teknetics youtube video demonstrating ability to pull good signal out of rusty nails that was unbelievable. That super fast recovery speed was amazing. Is that unique to Teknetics? V3i maybe, but its heavy and expensive.
I believe one company (First Texas) owns Bounty Hunter, Teknetics, and Fisher. I believe Garretts is a different company altogether. Based upon my experience with the G2 (and the F4) I have to concur with your thoughts: they make very lightweight and powerful machines.
Whites has two lightweight machines in the F70/AT Pro price range: the MX 5 and the MX Sport. I'd guess that the MX 5 is roughly the same weight as the F70/AT Pro and it is probably close to them with regards to recovery speed (having not used either the F70 or the AT Pro, I must guess and could well be wrong). I believe the MX Sport is probably a pound heavier than the F70 and slightly heavier than the AT Pro. I'd guess that the MX Sport is faster (recovery) than the AT Pro and every bit as fast as the F70 (again, I'm just guessing).
There are always trade-offs though.
The F70 — from what I've seen/read online — is wicked fast and deep. It is also very lightweight and reasonably sturdy (especially when the light weight is considered). It isn't waterproof though.
The AT Pro — from what I've seen/read online is a good all-around detector that can go in the water. My own opinion is that the screen is far too small for my aging eyes.
The MX 5 — lightweight machine with very fast recovery. It is a very sturdy machine too. It is “weatherproof” (not waterproof) which I take to mean it can handle being used in the rain. It is a threshold machine, so you'll have some noise. The ground balance is auto and cannot be locked. I believe it is no longer in production (beginning of 2017).
The MX Sport — probably the heaviest of the 4 machines mentioned. It is lightweight, wicked fast and deep. I can't tell you much more than that because I haven't used it enough to really know. I believe it is the most expensive of the 4 machines mentioned. It is waterproof to 10 feet.
Swing a MX 5 and the MX Sport at your local Whites dealer; I think you'll find that Whites is still very much in the game. (I'd try out the other brands too — find out which one is the right machine for you)
I did see that Teknetics is coming out with 3 new machines (sometime in March). One of those new machines (the Patriot, I believe) seems to be a F70 with some new paint — and a $200 discount from the cost of the F70. That machine sure has my attention.
Tesoro has their new Mojave out too. At a mere $251.10 it looks to be a souped-up Compadre coupled with a new coil. The reviews are fantastic so far — enough so that it seems the company can't keep up with the demand. I'd guess that it is lighter in weight than even the F70, and faster too. No display though and I'd be shocked if the Mojave went as deep as the F70.
I have no doubt about the ability of various Teknetics machines pulling coins out of areas loaded with rusty nails. The G2 could do it with ease, but so can the Euro Tek Pro (entry level machine from Teknetics). With the exception of the Beach Hunter 300 (coil is far too large) every machine I own can pull coins out of the nails — the Compadre excels at it. (Most of the places I hunt have tons of nails and other trash).
I think you'd be very pleased with any of the mid-range lightweight machines out there. They're all good machines and they'll all sniff coins out of nails. Put a small coil on them and they'll all shine.
Happy hunting and let us know which machine you choose.